the sum of 20 and diffrence of 6

Question

i need it right now asap

Answer 1

I assume you mean the sum of two numbers is 20 and the difference is 6

x+y=20

x-y=6

Add y to both sides

x=y+6

substitute into first equation

y+6+y=20

2y+6=20

Subtract 6 from both sides

2y=14

y=7

Since x+y=20

x+7=20

x=13

To check

13+7=20

13-7=6