Question

f(x) = a× + b
f(0) = 3 e f( 1 ) = 5​

Answer 1

$f(0) = 0a + b = 3 \\ b = 3 \\ ........................................................ \\ f(1) = 1a + b = 5 \\a + 3 = 5 \\ a = 2$

então:

$f(x) = 2x + 3$