Question 661564
x = mom
y = daughter
x+y=60
x - 10 = 7(y-10)
Substitution
(7(y-10)+10) + y = 60
7y - 70 + 10 + y = 60
8y - 60 = 60
8y = 120
y = 15
x = 60 - 15 = 45 is mom's present age