Question 82871
Let x = 1st number and y = 2nd number.

x-y=45

y=3x-3

plug in the second equation to the first.

therefore,

x-(3x-3)=45
x-3x+3=45
-2x+3=45
3=45+2x
3-45=2x
-42/2=x
-21=x


and

-21-y=45
-21-45=y
-66=y.