Question

Which of the following functions has a graph that is a line?
f(x) = x
f(x) = x 2
f(x) = |x|

Answer 1

1 st one

Answer 2

Well, if you have mastery of your library functions (those ones that are the basis for lots of others) this isn't too hard. The absolute value function looks like a V. The quadratic function is a parabola. The identity function is a line. The first one f(x)=y=x is sometimes called the identity function.