Question

dessa aqui (1,-7)eb(3,-5)

Answer 1

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Ola Marciela 

a(1,-7) e b(3,-5)

f(x) = ax + b

f(1) = a + b = -7

f(3) = 3a + b = -5

2a - a = - 5 + 7 = 2

a = 1

b = -7 - 1 = -8

f(x) = (x - 8