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2x﹣2y=2 3x﹣3y=2 2x﹣y=4 2x﹣2y=4
x+2y=1 3x+2y=﹣8 5x+4y=﹣3 3x﹣4y=﹣8
由,得2x - 1 = 3 - 3x; 由,得2(x - 2) - 3x - 2 = - 4 由,得3y + 3 = 2y - 3y + 1 - 6y; 由,得12x - 1 = 5y + 20
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)
6x-3y=3 y=-1 –y=-1 -3y=-1
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)
(x+3)2+(y-1)2=4 (x-3)2+(y+1)2=4 (x-3)2+(y+1)2=16 (x+3)2+(y-1)2=16
y2-7y+6=0 y2+6y-7=0 6y2=7y+1=0 6y2+7y+1=0
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)