Question

Solve the system by either substituition or elimination:
2x+5y=-22
5x-7y=23

Answer 1

solve it

Answer 2

Thanks :)

Answer 3

PLease hit good answer for imran. thank you

Answer 4

To solve, you need to eliminate one of the variables. To eliminate one of the variables, you need to multiply the equations with a number that allows you to eliminate one of the variables.

Answer 5

Thank you GT...much more helpful

Answer 6

For example, multiplying the first equation by 7 and second equation by 5 will allow you to get rid of y.

Answer 7

So 14x + 35y = -154
25x - 35y = -115

Answer 8

ok so u claick good answer then say hi and then say goodbye and then when u click good answer for me b sure to smile. o and to solve the problem u do this then that. and then if u still cant solve it then push the problem aside and yell at it saying "Y R U SO HARD TO FIGURE OUT!!!" then walk away...;)

Answer 9

Right. Now, add the two equations. you will get an equation in just x. Solve for x. Then, substitute that value of x into one of the equations to find the value of y.

Answer 10

It is +115 not -115.

Answer 11

Right

Answer 12

Subtract the two lines?

Answer 13

I call it add. When you add 35y and -35y, you eliminate y. You can think of subtracting if that helps.

Answer 14

x=-1?

Answer 15

2x+5y=-22 multiply this entire equation by 5
5x-7y=23 multiply this entire equation by 2

10x + 25y = -110
10x - 14y = 46 Subtract this entire equation from the first equation. (or, equivalently, multiply it by negative one)

10x + 25y = -110
-10x + 14y = -46
==============
0x + 39y = -156 divide both sides by 39 to find y.

Once you have y, substitute it back into either of the original equations to solve for x. :)

Answer 16

Yes.

Answer 17

You got it. Good job.

Answer 18

And then like MT said, plug it in and solve for y right?

Answer 19

Correct.

Answer 20

y=-4