Linear functions

Question

Hello,

I would like it if you could please explain how to go about solving problems like the below I'm not sure how to start off.

Write a linear function f with f(0)=2 and f(2)=4. 

Answer 1

f(x) = y.

The number that goes between the parenthesis is an x-value (that is why an x is there!)

The number that f(x) equals is a y-value (that is why f(x) = y)

So f(0)=2 means when x=0, y=2. The line has the point (0,2)

f(2) = 4 means that when x=2, y=4. The line contains the point (2,4)

You need to find the slope.

The y-intercept, the value for b, is given (if you look hard enough).

See what you can do from here.