Which equation represents the statement?
juan's age, x, is 4 times his age 15 years ago.
x = 4x + 15
x = 4(x − 15)
x = 4 + 15x
x = 4x - 15

X is his current age.
x - 15 is his age 15 years ago.
If his current age, x, is four times his age 15 years ago, x - 15:
x = 4(x-15).

Hope this helps!