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3y-2x-7-0-x-2-4y-2-21-0-

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Question Number 26625 by Leong last updated on 27/Dec/17
3y−2x+7=0 x^2 −4y^2 −21=0
3y−2x+7=0x2−4y2−21=0
Answered by ajfour last updated on 27/Dec/17
(x−2y)(x+2y)=21 (2x−4y)(2x+4y)=84 (3y+7−4y)(3y+7+4y)=84 (7−y)(y+1)=12 y=5,1 for y=5, x=11 for y=1, x=5 hence (5,1) and (11,5) .
(x−2y)(x+2y)=21(2x−4y)(2x+4y)=84(3y+7−4y)(3y+7+4y)=84(7−y)(y+1)=12y=5,1fory=5,x=11fory=1,x=5hence(5,1)and(11,5).

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