Irene R. answered • 12/22/19

BS in Mechanical Engineering and Certified math teacher for 13 years

Let's let the variable ** y **represent Donna's age and the variable

**represent Cash's current age.**

*x*Then since Donna is 14 years older than Cash, we can write:

y = x + 14

Also Donna is 3 times as old as Cash, so we can write:

y = 3x

Since both these equations are equal to y, we can write:

x + 14 = 3x

We can subtract x from both sides of the equation and divide by 2 to solve:

x + 14 - x = 3x - x

14 = 2x

14/2 = 2x/2

x = *7 years old (Cash's age)*

Donna's age would be x + 14 = 7 + 14 = *21 years old (Donna's age)*