(x-5)do kwadr. - (x+2) do kwadr.=7y (y+4)do kwadr. - (y-2)(y+2)=8x x do kwadr. + 10x + 25- x do kwadr. +4x +4=7y y do kwadr. +8y +16-y do kwadr. - 4=8x -6x+29=7y 8y+16-4=8x /:8 -6x+29=7y y+1,5=x -6(y +1,5)+29=7y y+1,5=x -6y-9+29=7y y+1,5=x -6y-7y=-20 y+1,5=x -13y=-20 /:(-13) y+1,5=x y=1,54 1,54+1,5=x y=1,54 x=3,04
(x - 5)² - (x + 2)² = 7y (y + 4)² - (y - 2)(y + 2) = 8x x² - 10x + 25 - x² - 4x - 4 = 7y y² + 8y + 16 - y² + 4 = 8x -14x + 25 = 7y 8y + 20 = 8x / ÷ 8 -14x + 25 = 7y y + 2,5 = x -14 ( y + 2,5 ) + 25 = 7y y + 2,5 = x y + 2,5 = x -14y - 35 + 25 = 7y y + 2,5 = x -14y - 7y = 10 y + 2,5 = x -21y = 10 / ÷ -21 y = - 10/21 ≈ -0,5 -0,5 +2,5 = x y= -0,5 x= 2
