tolong ya bantuan nya

-x+2y = -1 | ×2 -> -2x+4y = -2
2x+3y= 9 | × 1 -> 2x+3y = 9
----------------- +
maka,
7y=7
y =1

-x+2y=-1
2.1+1 = x
x = 3

x + y = 3 + 1 = 4

Mohon koreksi ulang, semoga membantu.