9514 1404 393
Answer:
C
Explanation:
The problem statement tells you that cost is a function of x minutes. We plot the independent variable (x) on the horizontal axis, so this statement tells you the horizontal axis will be labeled "Minutes." (matches A and C)
When x=0 (no minutes), the function value is ...
c(0) = 3·0 +2 = 2
For each additional minute, the cost goes up by 3, so we know these things about the line:
- the y-intercept c(0) is 2
- the slope is 3 = rise/run
The graph of A has a y-intercept of 3, so is incorrect. It also has a slope of 2, so is incorrect on that basis, as well.
The graph of C is the correct choice.