Roxanne is measuring the diameter and the radius of different-sized circles. There is a proportional

relationship between the radius of the circle in inches, x, and the diameter of the circle in inches, y.

A circle with a 2-inch radius has a diameter of 4 inches. Write the equation for the relationship

between x and y

Answer: y = 2x

Step-by-step explanation:

Hi, to answer this question we have to write an equation with the information given:

Since a circle with a 2-inch radius has a diameter of 4 inches, it means that the diameter of a circle (y) is equal to two times its radius (x).

Mathematically speaking:

y = 2 x

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