X + 2y = 7
2x + y = 5
What’s the substitution

Answers

Answer 1

You can subtract 2y from both sides of the first equation and then plug that (x = 7 -2y) into the second one to get:

14 - 4y  + y = 5 -->

14 - 3y = 5 -->

-3y = -11 -->

y = 11/3 -->

x = 2/3


Related Questions

what is the total area of the three triangle ?​

Answers

Answer b. 13 square units

In ΔXYZ, z = 46 cm, x = 45 cm and ∠Y=81°. Find the length of y, to the nearest centimeter.

Answers

Answer:

If the question is supposed to be solved using the pythagorean thorem, y≈64.35

Answer:

59

Step-by-step explanation:

PICTURE PROVIDED JUST TELL ME IF IT IS A FUNCTION AND WHY

Answers

Answer:

This is a function because the Y values do not repeat.

5t + 15 ≥ 50
What's the answer?

Answers

the answer is t>7 . divide all by 5, subtract 3 from both sides and then you’re left with t>7

Answer:

Subtract 15 from both sides.

5t > 35

Divide both sides by 5.

t > 7

(Sorry, I can't do the > with the _ under it.)

Please mark me Brainliest; I need it to move onto the next level. =D

A bag had 7 orange rocks , 6 green rock , 1 white rock ,7 black rocks , and 2 yellow you randomly pull a rock from the bag ,keep it out , and then pull out another one .

What is the probability of getting a yellow rock and then a n orange rock ?

Answers

Answer:

[tex]Probability = \frac{7}{253}[/tex]

Step-by-step explanation:

Given

[tex]Orange = 7[/tex]

[tex]Green = 6[/tex]

[tex]White = 1[/tex]

[tex]Black = 7[/tex]

[tex]Yellow = 2[/tex]

Required

Probability of selecting a yellow then orange rock

From the question, we understand that the probability is that of without replacement.

Since the yellow, is first picked.

We need to determine the probability of picking a yellow rock, first.

[tex]P(Yellow) = \frac{n(Yellow)}{Total}[/tex]

[tex]P(Yellow) = \frac{2}{7 + 6 + 1 + 7 + 2}[/tex]

[tex]P(Yellow) = \frac{2}{23}[/tex]

The rock has reduced by 1;

Next is to determine the probability of picking an orange rock

[tex]P(Orange) = \frac{n(Orange)}{Total - 1}[/tex]

[tex]P(Orange) = \frac{7}{7 + 6 + 1 + 7 + 2- 1}[/tex]

[tex]P(Orange) = \frac{7}{22}[/tex]

The required probability is calculated as thus:

[tex]Probability = P(Yellow) * P(Orange)[/tex]

[tex]Probability = \frac{2}{23} * \frac{7}{22}[/tex]

[tex]Probability = \frac{14}{506}[/tex]

[tex]Probability = \frac{7}{253}[/tex]

Question 1
A research lab studied the effects that temperature has on the
growth of a certain plant. At 60°F, the plant grows 1.25 cm
per week. At 80°F, the plant grows 2.75 cm per week. How
fast can we expect the plant to grow at 72°F in one week?

A. 1.36 cm
B. 1.5 cm
C. 2.15 cm
D. 2.48 cm

Answers

I think the answer is C not sure lol

Help plsssss!!!!!!!!!!!!!

Answers

Answer:

The second option

Step-by-step explanation:

parker wants to price the total cost of a new coat the coat cost $15.99 plus taxes there is a 7% tax on the coat how much taxes will she have to pay

Answers

Answer:

$17.11

Step-by-step explanation:

15.99*1.07 = 17.109 round up and you get 17.11

What is the slope of the two points (-2,7) and (4,-8)

Answers

Answer:

-15/6

Step-by-step explanation:

If you look at the first number in each point, the x coordinate, you see the 2nd point is 6 forward from the 1st point. Now the 2nd number is the y coordinate, and you can see it goes down 15 from the 1st coordinate. So y/x is the slope.

Answer: -2 1/2

Step-by-step explanation:

Slope= Yb-Ya/Xb-Xa

In this case= (-8-7)/(4- -2)

This equals -15/6

Simply to -2 1/2

Determine the zeros or roots of each function or equation. You can use the quadratic equation if you need to.

f(x)=-8x^2+2x+1

Answers

-1/4, 1/2

step by step explanation:

Which of the following expressions is modeled on the number line?

Answers

Answer:

2 x 3

Step-by-step explanation:

Since it starts at and goes right twice in intervals of 3, you can conlude that the answer would be 2 x 3 because it corresponds with the previous numbers stated.

REFLECT - How many triangles and how many rectangles are in a net for a right triangular
prism? How do you know?

Answers

Answer:

2 triangles and 3 rectangles

Step-by-step explanation:

Because all triangular prisms have 2 triangle faces and 3 rectangle faces

I’m unsure on this one

Bobby and his brother had 3/4 of a pizza leftover after dinner. Their father came home and are 1/2 of the leftover pizza .how much pizza did their father eat

Answers

Answer:

3/8 of the pizza

Step-by-step explanation:

3/4*reciprocal of 2

3/4*1/2

3/8

3/8

3/4÷1/2= 0.375

0.375= 3/8

State the domain of f•g. Then find f•g, including any additional restrictions necessary on the domain of the composition

Answers

Answer:

Answer is option A

Step-by-step explanation:

The required function [f o g(x)] is -7/√(x + 3).

The domain of the function  [f o g(x)] > - 3.

What is a function?

A function is  the relation between two sets. The first one is called domain and the second one is called range.

Given, f(x) = - 7/x

g(x) = √(x + 3)

Therefore, f o g(x)

= f[g(x)]

= f[√(x + 3)]

= -7/√(x + 3)

Now, the domain of f o g(x) > - 3.

Learn more about a function here: https://brainly.com/question/12396459

#SPJ3

4) Find the LCM of 20 and 9​

Answers

180 is the least common multiple.

Answer:

least common multiple is 180

5x + 8 - 7x = -4x + 1
Choose 1 answer:
А
No solutions
Exactly one solution
Infinitely many solutions

Answers

Step-by-step explanation:

5x+8-7x=4x+1

5x+7x-4x=8+1

8x=9

What value of x makes this equation true? 2(4x-3) - 8= 4+2x​

Answers

Answer:

What value of x makes this equation true? 2(4x-3) - 8= 4+2x​  HERE YOU GO!!

Step-by-step explanation:

We need to eliminate one of the variables to solve the other.

 

4x+5y = 8

2x-3y = 18

I will multiply the second equation by -2.

 

-2*(2x-3y = 18)

-4x + 6y = -36 and then add the two equations

 

4x + 5y = 8

-4x + 6y = -36

+ adding here

11y = -24

y = -24/11

substitute x in one of the equations to find y.

2x-3y=18

2x - (3*-24/11) = 18

2x = 126/11

x = 126/22

b)simplify the expression
7x2 + 4x – 2 + 8x2 – 9x – 5

Answers

Answer:

=25x-7

Step-by-step explanation:

Could someone help me with this. Than u
Also if u can put it step by step how u do it.

Answers

Answer:

X=3,-3

Step-by-step explanation:

Given: -4x + 2y = 8
Prove: y = 4 + 2x​

Answers

Answer:

Step-by-step explanation:

-4x+2y=8

2y=8+4x

y=[tex]\frac{8+4x}{2}[/tex]

y=[tex]\frac{2(4+2x)}{2}[/tex]

y=4+2x  

proved

How to solve this problem because I have no clue in what I’m doing here plz help

Answers

Answer:

Step-by-step explanation:

Be cool

Which numbers are rational?
-8 , 6 , 0 , 19/8 , 4.35 , 7/4

Answers

Answer:

-8, 6, 0, 19/8, 4.35, 7/4 all of them

Step-by-step explanation:

hope this helps! :)

PLEASE HELP MEEE!! 10 points

Answers

Answer:

Slope=3/2

Slope=rise/run

Graphing this you go up 3 and to the right 2

Y-intercept= 9

Slope intercept form= 3/2x+9

which means the y-intercept is 9

(x/x+1) - (2x+1)? how do i do this people?

Answers

Answer:

x=1

Step-by-step explanation:

Find the measures of the sides of triangle DEF, then classify it by its sides. YOU MUST SHOW WORK TO GET CREDIT!

D(-2, 3), E(5, 5), F(-4, 10)

Answers

Answer:

FE = 10.30

ED = 7.62

FD = 7.28

Step-by-step explanation:

First, use coordinate system to draw a square that each angle of triangle reach the sides of the square, then use Pythagoras theory to find the length of the sides(c^2=a^2+b^2)

FE = root(9^2+5^2) = root(106) = 10.30

ED = root(3^2+7^2) = root(58) = 7.62

FD = root(2^2+7^2) = root(53) = 7.28

Which of the following are solutions to the inequality, 16 < 15 x − 12 ? Select all that apply.

Group of answer choices

-26

3.25

1.8

22/17

28/15

1.86

1.87

25/7

Answers

Answer:

25/7, 1.87, 3.25, and 22/7

Step-by-step explanation:

16 < 15x - 12

__________

+12. +12

__________

28 < 15x

__________

÷15 ÷15

__________

28/15 < x

__________

x > 28/15

__________

this is true for any number greater than 1 and 13/15 = 1.8666......

Pls I really need help

Answers

Answer:

Greater

Step-by-step explanation:

Greater
Because if you do 86,500 minus 26,375 then you get 60, 125 which is greater than 60,000

I need help please the faster the better.

Answers

Answer:

(5,-8)

Step-by-step explanation:

You would go to the right then down 8

Answer: plot a point at (0, -8) (1, -5) (2, -2) (-1,-12) and draw a straight line connecting them

Step-by-step explanation: plug in points to the equation and solve

help pleaseeeeee thanks .


is-2 a solution of the inequality -2x+5__> 9 ?

Answers

Answer:

Yes

Step-by-step explanation:

-2 plugged into x would give you 4 then 4 + 5 is 9

Which correctly applies the distributive property to show an equivalent expression to (–2.1)(3.4)? (2)(3) – (0.1)(0.4) (–2)(3) + (–0.1)(0.4) (2.1)(3) – (2.1)(0.4) (–2.1)(3) + (–2.1)(0.4)

Answers

Answer:

d i hope

Step-by-step explanation:

good

Answer:

I think it is c

Step-by-step explanation:

hope this helps

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