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1. Additive
2. Multiplicative

y = 10x

y = x + 2

y = x - 3

y = x - 5

y = 2x + 10

y = 1/2 x

y = x/3

y = x + 5

y = 1/2 x + 5

y = 5x

y = 25x

y = x - 1

y = x + 10

y = x/4