Question 185009
one number equals three times another number.the difference between the numbers is 10.find the numbers.

one number = x
another number = y

x=3y
x-y=10

substitute:
x-y=10 turns into
3y-y=10 (simplify)
2y=10 (divide by two)
y=5

put back into original equation:
x=3y
x=3(5)
x=15

<b> x=15, y=5 <b>