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4x - 2y = 10 | ×1
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4x + 8y = 40
4x - 2y = 10 -
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6y = 30
y = 30 : 6
y = 5
4x - 2y = 10
4x - 2×5 = 10
4x - 10 = 10
4x = 10 + 10
4x = 20
x = 20 : 4
x = 5
x . 2y
= 5 . 2 . 5
= 50
Jawaban: B