The formula for the circumference of a circle is c = 2r, where r is the radius and c is the circumference. the equation solved for r is r = . find the radius of a circle that has a circumference of 16.

The value of the radius is

Step-by-step explanation:

we know that

The circumference of a circle is equal to

where

r is the radius of the circle

Solve for the radius

In this problem we have

Substitute and solve for r

The value of the radius is

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18