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x - 2y = 4 | x4
4x + 3y = 5
4x - 8y = 16
__________ -
11y = -11
y = -11/11
y = -1
x - 2y = 4
x - 2(-1) = 4
x + 2 = 4
x = 4 - 2
x = 2
ax + by = 0
2a - b = 0
2a = b
a/b = 1/2