Question

The sun of two numbers is 25. One number Is twice the second number +7 what are the two numbers?

Answer 1

19 and 6

Explanation:

x(the big number) y (the small number)

x=2y+7

x+y=25

2y+7+y=25

3y=18

y=18/3=6

x+6=25

x=25-6=19

Answer 2

19

Explanation:

x+y=25 => x=-y+25

x= 2y+7

x=-y+25

x=2y+7

subtract the first equation from the 2nd

0=3y-18

y=6

x=19