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f(2) = 2a + b = - 2
f(3) = 3a + b = 13
--------------------------(-)
- a = - 15
a = 15
2a + b = - 2
2.15 + b = - 2
30 + b = - 2
b = - 2 - 30
b = - 32
f(x) = 15x - 32