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x + y + 5 = 0
x + y = -5
x + 5y = -5
x + y = -5 _
4y = 0
y = 0
x = -5
untuk no 4
2x - 3y = 11
3x + y = 0 -------> 9x + 3y = 0
2x - 3y = 11
9x + 3y = 0 +
11x = 11
x = 1
2x - 3y = 11
2 - 3y = 11
2 - 11 = 3y
-9 = 3y
y = -3
2x-3y=-11
3x+y=0
y=-3x
2x-3y =-11
2x-3(-3x)=-11
2x-9x =-11
-7x =-11
x =-11+7
x =-4
3x+y =0
3(-4)+y=0
-12+y =0
y =12