連立方程式L1-加減法7(8問)
6x+15y=-8 5x-6y=18
解答○ ×答: x=2 y=-43
3x-6y=7 2x+9y=-4
解答○ ×答: x=1 y=-23
4x-3y=8 6x+8y=-13
解答○ ×答: x=12 y=-2
4x-12y=-15 7x+8y=-19
解答○ ×答: x=-3 y=14
-2x+8y=-7 10x+3y=-8
解答○ ×答: x=-12 y=-1
18x-6y=7 4x-9y=-1
解答○ ×答: x=12 y=13
-8x+6y=9 12x-8y=-11
解答○ ×答: x=34 y=52
-15x-18y=-20 9x+24y=34
解答○ ×答: x=-23 y=53
問題と解答
6x+15y=-8 5x-6y=18 答: x=2, y=-43 3x-6y=7 2x+9y=-4 答: x=1, y=-23 4x-3y=8 6x+8y=-13 答: x=12, y=-2 4x-12y=-15 7x+8y=-19 答: x=-3, y=14 -2x+8y=-7 10x+3y=-8 答: x=-12, y=-1 18x-6y=7 4x-9y=-1 答: x=12, y=13 -8x+6y=9 12x-8y=-11 答: x=34, y=52 -15x-18y=-20 9x+24y=34 答: x=-23, y=53
