連立方程式(計算練習11)
連立方程式を解け
-4x+9y=43 x=3y-138x+y=37 -8x+3y=-17-9x+8y=4 5x-12y=-407x-2y=11 2x-y=4y=11x-13 2x-y=418x+11y=-4 10x-13y=36x-5y=7 2x-7y=11-2.1x+1.8y=-12 4.2x+7.2y=2.44x-3y=2(x+y-5) -(2x-7y)=142110x+15y=65 -x+y=13658x-34y=4124 -14x+13y=-5623x-14y=43x-32y-76=x-29y+1318