Question

original question: solve the system of equations.
3x-5y=16
-5x+7y=-16

i multiplied the top by 5 and the bottom by 3 and got
15x-25y=80
-15x+21y=-48

Now what is x & y?

Answer 1

now you can add the two equations together easily. 15x-15x-24y+21y=80-48. so -24y+21y=80-48, and -3y=32, just solve for y. then plug that value into EITHER equation (doesn't matter which) and solve for x

Answer 2

*correction -25y not -24y, sorry!

Answer 3

but 32 divided by -3 doesnt work out

Answer 4

why not? y=32/-3

Answer 5

so 15x-25(32/-3)=80

Answer 6

oops, no i made a mistake it is -25y not -24y
should be -4y=32

Answer 7

15x-25(-8)=80

Answer 8

15x-200=80

Answer 9

Are these slopes?