Operations with functions question

[super_chris]

Hi, I was wondering if anyone would be able to help me solve these four questions in my text book. I'm doing a refresher course prior to starting an aerospace engineering program in January.

Given
f={(-2,4),(0,-2),(1,2),(2,3)} and g(x)=3x-5

a) find f(-2)

I'm assuming I'll have to find the equation of the line for function "f", then perform the operation. Any help would be greatly appreciated.

Thanks

 

[srmichael]

Wouldn't f(-2) = 4? After all, (-2,4) is a coordinate for the f(x) function.