Gunakan metode campuran! a) x+y=-3. 2x-2y=10

x + y = - 3 |×2
2x - 2y = 10
maka
2x + 2y = - 6
2x - 2y = 10
--------------------(-)
4y = - 16
y = - 4
disubtitusi ke pers :
x + y = - 3
x - 4 = - 3
x = - 3 + 4
x = 1
hp = {1 , - 4}