Question

Solve the following system.
x2 + y2 = 13
2x - y = 4

Answer 1

Solve 2x-y=4 for y

plug the solution you just found for "y" into the first equation, and solve that equation for x.

You now have the answer for "x". Now plug that answer for into 2x-y=4 and solve for y. You now found the answer for y

Answer 2

use substitution
from second equation y = 2x-4
replace y in the first equation with 2x-4
and solve for x

then plug this value of x into the second equation to find y

Answer 3

i figured i needed to use substitution but i wasn't sure