The ratio (y+x) : (y-x) is equivalent to k : 1.Find an expression for y in terms of k and x.
(y+x) / (y-x) = k/1
y+x = ky - kx
y-ky = -kx-x
y (1-k) = x (-k-1)
y = x (-k-1)/(1-k)
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