SOLUTION: Find two possitive numbers whose product equals 357, and whose difference is 4. (use systems of equations to solve)?

Question 447523: Find two possitive numbers whose product equals 357, and whose difference is 4. (use systems of equations to solve)?
Found 2 solutions by jorel1380, josmiceli:
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
xy=357
x-y=4
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x-4=y
x(x-4)=357
x2-4x-357=0
(x-21)(x+17)=0
x=21 or -17
Throwing out the negative answer, we get x=21, y=17..

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

By substitution:

Use the quadratic formula

The numbers are 17 and 21
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