1/4×+1/2y=-5 x+3/2y=2 tentukan x dan y

1/4x + 1/2y = -5......X4
x + 3/2y = 2

(x + 2y = -20) - (x + 3/2y = 2) = 2y - 3/2y = -22
=> 1/2 y = -22
y = -22 : 1/2
y = -44
=> x + 2y = -20
x + 2.(-44) = -20
x = -20+88
x = 68