two numbers that add to 15 and divid to 2

Answer 1

Lets set our equations

x + y = 15

x / y = 2

Solve the first equation for x.

x = 15 - y

Substitute x in the second equation.

(15 - y) / y = 2

15 / y - y / y = 2

15 / y - 1 = 2

15 / y = 3

15 = 3y

5 = y

Now substitute y into the first equation.

x + 5 = 15

x = 10

Our solution is x = 10, y = 5