Answer:
9 and 21
Step-by-step explanation:
<u>setting up the equation</u>
let x and y represent the two numbers
this means that x + y = 30
x - y = 12
<u>using substitution to solve</u>
if x - y = 12, that can be rearranged to x = y + 12.
substitute x = y + 12 into x + y = 30
you get (y + 12) + y = 30
simplify
2y + 12 = 30
2y = 18
y = 9
plug this into the original equation x + y = 30. this would be
x + 9 = 30
x = 21
the numbers are 21 and 9.
