Write a linear function f with f(−3)=1 and f(13)=5.

Answer 1

see my comment for how to derive the linear function

the line is y=(1/4)x + 7/4 or

4y = x+7 or f(x) = (1/4)x + 7/4

they're all the same line, equivalent functions, with slope = 1/4 and y intercept = 7/4