Let's say Mary's brother's age is x and Mary's age is y
(1) x = 3y - 5
(2) x + y = 39
Now if we substitute equation (1) into equation (2) we get:
3y - 5 + y = 39
4y = 44
y = 11
Therefor Mary is 11 years old
Answer:
131
Step-by-step explanation:
8 * 12 = 96
7 * 5 = 35
96 + 35 = 131
Answer:
quadratic formula
Step-by-step explanation:
just accept it
