Question 951843
x and y are the numbers.
x-y=9 Add y to each side.
x=y+9
3(x+y)=45 Substitute for x
3((y+9)=y)=45 Divide each side by 3.
2y+9=15 Subtract 9 from each side.
2y=6 Divide each side by 2.
y=3 ANSWER 1: one of the numbers is 3.
x=y+9=3+9=12 ANSWER 2 The other number is 12.
CHECK:
4(x+y)=60
4(12+3)=60
4(15)=60
60=60