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﹣2x+2y 6x+2y ﹣2x﹣8y 6x﹣8y
y2+8y﹣7=0 y2﹣8y﹣7=0 y2+8y+7=0 y2﹣8y+7=0
x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
y2=8x y2=-8x x2=8y x2=-8y
(3,7) (9,25) (13,49) (9,49)
x2+y2﹣2x﹣6y=90 x2+y2﹣2x﹣6y=0 x2+y2﹣4x﹣2y=0 x2+y2﹣4x﹣8y=1
x2=8y y2=-8x y2=8x x2=-8y
2x+y﹣8=0 3x﹣2y+1=0 x+2y﹣5=0 3x+2y﹣7=0
2x+3y﹣8=0 3x﹣2y+1=0 x+2y﹣5=0 3x+2y﹣7=0
x+2=0,7x﹣24y+14=0 y+2=0,7x+24y+14=0 x+2=0,7x+24y+14=0 y+2=0,7x﹣24y+14=0