5x - 4y = -23 -5x + 9y = 8 bisa di bantu

5x - 4y = -23
-5x + 9y = 8
------------------- (+)
5y = -15
y = -3

-5x + 9y = 8
-5x = 8 - 9y
-5x = 8 - 9(-3)
-5x = 8 + 27
-5x = 35
x = -7

5x - 4y =-23
-5x +9y =8
-------------------- +
5y = -15
y = -15/3
y = -3

5x - 4y = -23
5x-(4.-3)=-23
5x+12 =-23
5x =-23-12
x. =-35/5
x =- 7