Question

What are 2 numders that add up to 13 and minus 5?

Answer 1

Answer:

Eq 1 ) x + y = 13  

x = (13 - y)     --------- 1

Eq 2) x - y = 5

Substituting 1 in the place of x,

13 - y -y = 5

13 - 2y = 5

- 2y = 5 - 13

-2y = -8

2y= 8 ( Cutting minus from both the sides)

y = 4

Takouting x, by replacing y in equation 2

x - y = 5

x - 4 = 5

x = 5 + 4

x= 9

Both the numbers are 9 and 4.

Hope it helps!