Question

The sum of two numbers is 52 . One number is 3times as large as the other. What are the numbers?

Answer 1

x + y = 52
x = 3y

substitute the second equation into the first one and solve

Answer 2

what number did you get that went into 52 3times

Answer 3

i didn't do that.

i plugged the second equation in the first one.

so x + y = 52 becomes:

3y + y = 52
4y = 52
y = 13

plug y in the second equation (which is x = 3y)

x = 3(13) = 39