連立方程式L1-代入法2(6問)
x=-3y-7 2x+5y=-10
解答○ ×答: x=5 y=-4
y=3x-11 5x+2y=0
解答○ ×答: x=2 y=-5
3x+4y=6 x=-3y+7
解答○ ×答: x=-2 y=3
3x-4y=-1 y=2x+9
解答○ ×答: x=-7 y=-5
x=3y-29 -5x-2y=-42
解答○ ×答: x=4 y=11
7x+5y=-21 y=-4x+27
解答○ ×答: x=12 y=-21
問題と解答
x=-3y-7 2x+5y=-10 答: x=5, y=-4 y=3x-11 5x+2y=0 答: x=2, y=-5 3x+4y=6 x=-3y+7 答: x=-2, y=3 3x-4y=-1 y=2x+9 答: x=-7, y=-5 x=3y-29 -5x-2y=-42 答: x=4, y=11 7x+5y=-21 y=-4x+27 答: x=12, y=-21
