The sum of two numbers is 18 and their difference is six. Whats the awnser?

Question

Bigger number:12

Smaller number:6

(owo)

Answer 1

You already have the answer but here is how you get it.

1)   x + y = 18

2)   x - y  =  6

rewrite equation --  x = 6 + y

insert rewritten equation into #1

6 + y + y = 18

6 + 2y = 18

6 – 6 + 2y = 18 – 6

2y =12

y = 6

Substitute y back into the equation.

x +y = 18

x + 6 = 18

x + 6 – 6 = 18 - 6

x = 12