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Verified answer
4x + y = 7 | ×2 |3x - 2y = 8 | ×1 |
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8x + 2y = 14
3x - 2y = 8
------------------- +
11x = 22
x = 2
3x - 2y = 8
3 (2) - 2y = 8
6 - 2y = 8
-2y = 2
y = -1
Maka,
y - 10x
= -1 - 10 (2)
= -1 - 20
= -21