Math

x^2 + 9y^2 = 37
x - 2y = -3
simultaneous equation by elimination

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1. elimination is usually done with linear equations. Using substitution,

x = 2y-3, so we have

(2y-3)^2 + 9y^2 = 37
4y^2 - 12y + 9 + 9y^2 = 37
13y^2 - 12y - 28 = 0
(y-2)(13y+14) = 0

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posted by Steve

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