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2x﹣2y=2 3x﹣3y=2 2x﹣y=4 2x﹣2y=4
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
y+3=2(2﹣y) 6y+3=2(2﹣y) 6y+3=4﹣y 6y+3=2﹣y
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)
y2+y-6=0 y2+y+6=0 y2-y-6=0 y2-y+6=0
①×4+②得8x﹣4y+3x+4y=20+2,可消去y ①×4+②得2x﹣4y+3x+y=5+2,可消去y ①×3﹣②×2得3(2x﹣y)﹣2(3x+4y)=3×5﹣2×2,可消去x ①×(﹣3)+②×2得﹣3(2x﹣y)+2(3x+4y)=﹣3×5+2×2,可消去x
①×3-②×2,消去x ①×2-②×3,消去y ①×(-3)+②×2,消去x ①×2-②×(-3),消去y
2y=18-3(y+1) 2y=3-3(y-1) y=3-(y-1) 2y=18-3(y-1)