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(x-1)/(y-1) = 1/4
3(x+4) = 2(y+4)
4(x-1) = y - 1
3x + 12 = 2y + 8
4x - 4 = y - 1
3x = 2y - 4
-y = 3 - 4x /: (-1)
3x = 2y - 4
y = -3 + 4x
3x = 2(-3 + 4x) - 4
y = -3 + 4x
3x = -6 + 8x - 4
y = -3 + 4x
-5x = -10 /:(-5)
y = -3 + 4x
x = 2
y = 5