Which of the following describes a linear function?
it is v shaped and passes through the origin.
it is a straight line in one portion and a curve in another portion.
its y-values decrease at a constant rate as its x-value increases.
its y-values increase at a nonconstant rate as its x-value increases.

i think its b

Step-by-step explanation:

All linear functions can be written as

The coefficient m is the slope of the line, and it is the constant rate of change for y, depending on the change of x.

Consider, for example, the function

If we start with x=0, we have y=3.

Then, if we increase x by 1 step by step, we have

So, as you can see, as we constantly increase x (by 1), y constantly decreases (by 2, which is the slope of the line: -2)

0,0

step-by-step explanation: