Question

I need help solving this system of equations with elimination method
8x-5y=17
-8x+5y=-21

Answer 1

you multiply the first equation with -

it becomes -8x+5y=17

then you add them to each other which makes

-8x-8x+5y-5y=17-21

-16x=-4
x=0.25

8x=2
5y=15
y=-3