Isolate x.
24x = 48 - 2y
Divide by 24.
x = 2 - y/12
These solutions can be called “roots”, “zeroes”, and “x-intercepts”.
The formula for the circumference of a circle = 2 x radius x pi
The radius is given as 21 cm and pi = 3.142
Circumference = 2 x 21 x 3.142 = 131.964 cm
