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x - 4y = 7 | *2 | 2x - 4y = 14
2x + y = 4 | *1 | 2x + y = 4
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-5y = 10
y = 10 : -5 = -2
x - 4y = 7
x - 4(-2)= 7
x - (-8) = 7
x+ 8=7
x = 7-8= -1
jadi nilai x dan yang adalah -1 dan -2
maaf kalo salah
semoga membantu ;)