SOLUTION: what 2 numbers added together equal 12 and the same 2 numbers multiplied equal -45: what are the two numbers?

Algebra ->  Equations -> SOLUTION: what 2 numbers added together equal 12 and the same 2 numbers multiplied equal -45: what are the two numbers?      Log On


   

Question 1068453: what 2 numbers added together equal 12 and the same 2 numbers multiplied equal -45: what are the two numbers?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
system%28x%2By=12%2Cxy=-45%29

15 and -3.



Do you want to use algebra for that?
x=12-y
-
Substitute.
%2812-y%29y=-45
12y-y%5E2%2B45=0
-y%5E2%2B12y%2B45=0
y%5E2-12y-45=0
Factorable...
%28y%2B3%29%28y-15%29=0
.
.