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x - 2y = 10
---------------------- + (eliminasi)
4x = 8
x = 8/4 = 2
x-2y = 10
2-2y = 10
-2y = 10-2
-2y = 8
y = 8/-2 = -4
maka nilai x-4y = 2-4(-4)= 2+16= 18
X - 2Y = 10 +
4X = 8
X = 2
X - 2Y = 10
2 - 2Y = 10
-2Y = 10 - 2
-2Y = 8
Y = -4
X - 4Y
2 - 4(-4)
2 - (-16)
2 + 16
18