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December 21, 2014

December 21, 2014

Posted by **luckybee** on Sunday, December 16, 2012 at 6:19pm.

X^2 + Y^2 =70

Y= 2X + 5

- algebra system of equations -
**Steve**, Monday, December 17, 2012 at 12:21amsince y = 2x+5,

x^2+y^2 = 70

x^2+(2x+5)^2 = 70

x^2 + 4x^2+20x+25 = 70

5x^2 + 20x + 25 = 70

x^2 + 4x + 5 = 14

x^2 + 4x - 9 = 0

x = (-4±√52)/2 = -2±√13

y = 1±2√13

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