Question

x+y=5

y=2x^2-x-13

Answer 1

are we solving?

if so, from the first ----> y = 5-x
plug into the 2nd:

2x^2 - x - 13 =5-x
2x^2 = 18
x^2 = 9
x = ± 3
then
if x = 3, y = 2
if x = -3 , y = 8