Solve c = 2πr (solve for "r")
c = 15

For this case we have the following equation:

From here, we clear the value of r:

Substituting the values in the obtained equation we have:

Doing the calculations we have:

The value of r is given by:

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)