連立方程式L1-代入法1(6問)
x=2y x+5y=21
解答○ ×答: x=6 y=3
y=-4x 5x+y=3
解答○ ×答: x=3 y=-12
x-4y=5 x=-2y-7
解答○ ×答: x=-3 y=-2
3x+y=-14 y=-5x-22
解答○ ×答: x=-4 y=-2
x=-3y-5 -x-2y=2
解答○ ×答: x=4 y=-3
4x-y=26 y=-3x+16
解答○ ×答: x=6 y=-2
問題と解答
x=2y x+5y=21 答: x=6, y=3 y=-4x 5x+y=3 答: x=3, y=-12 x-4y=5 x=-2y-7 答: x=-3, y=-2 3x+y=-14 y=-5x-22 答: x=-4, y=-2 x=-3y-5 -x-2y=2 答: x=4, y=-3 4x-y=26 y=-3x+16 答: x=6, y=-2
