SOLUTION: One number is 4 more than 2 times another. Their product is 16. Find the numbers.

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Question 814080: One number is 4 more than 2 times another. Their product is 16. Find the numbers.

Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
x = 2y + 4
xy = 16

Substitute the first equation into the second.

(2y + 4)(y) = 16
2y^2 + 4y - 16 = 0
y^2 + 2y - 8 = 0
(y + 4)(y - 2) = 0
y = -4 or y = 2

solutions: (x, y) = (-4, -4) or (8, 2)