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^ 4y=16
^ y=4
x+2y=4
x+8=4
x=-4
x+6y=20
x+2y=4
------------------ -
4y = 16
y = 4
nilai x
masukkan nilai y ke salah satu persamaan
x + 2y=4
x + 2(4) = 4
x + 8 = 4
x = 4 - 8
x = -4
jadi x,y = {-4,4)
semoga membantu :)