Find two numbers with a sum of 20 and a difference of 14.

The anwser is 17 and 3. 17+3=20, and the difference is 14!

We can easily find this using equations. what do we know?

X + Y = 20 and

- (X - Y = 14) subtract the two equations ...

X + Y = 20

-X + y = - 14

2Y = 6

Y = 3 (our first number) (put this into an original equation and solve)

X + Y = 20

X + 3 = 20 subtract 3 from both sides

X = 17

gives us our answer ... 3 and 17