given that the function of c(v) = 5 + 3v, you can make a table by changing the value of v
if v = 0, c(v) = 5
if v = 1, c(v) = 8
if v = 2, c(v) = 11
if v = 3, c(v) = 14
if v = 4, c(v) = 17
as you can see, a graph of these results will produce a straight line; the formula for the line will be y = 3x + 5; the value for x will be equal to the value for v, and the intercept will be 5