Question

What is the value of the y variable in the solution to the following system of equations?
5x + 3y = 7
3x - 5y = -23

-1

1

-4

4

Answer 1

eliminate x

Answer 2

I got stuck at 3y=-5x+7

Answer 3

oh you doing sub method :)

Answer 4

it would be easier to use addition/subtraction of equations

Answer 5

15x+9y = 21
15x - 25y = -115

subtract

34y = 136

y = 136/34
y = 4

plug 4 back into original equations

5x +12 = 7

5x = -5

x = -1

Answer 6

okay thank you! :)

Answer 7

15x+9y = 21
15x - 25y = -115

subtract

34y = 136

y = 136/34
y = 4

stop there :P