a) x - y = 2 -> - y = 2 - x -> y = x - 2 -> f(x) = x - 2
b) 2x - y = 5 -> - y = 5 - 2x -> y = 2x - 5 -> f(x) = 2x - 5
c) - x - 3y = 1 -> - 3y = 1 + x -> 3y = - 1 - x -> y = - x/3 - 1/3 -> f(x) = - x/3 - 1/3
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a) x - y = 2 -> - y = 2 - x -> y = x - 2 -> f(x) = x - 2
b) 2x - y = 5 -> - y = 5 - 2x -> y = 2x - 5 -> f(x) = 2x - 5
c) - x - 3y = 1 -> - 3y = 1 + x -> 3y = - 1 - x -> y = - x/3 - 1/3 -> f(x) = - x/3 - 1/3