連立方程式(計算練習9)
連立方程式を解け
x=-5y+12 2x+7y=184x+5y=-23 4x+7y=-296x-5y=3 9x-7y=32x+5y=3 x+3y=22x-y=-3 y=3x+417x+4y=-22 13x-3y=-35x+2y=1 3x+y=-20.2x+0.5y=1.2 0.4x-0.3y=-0.24(3x-y)=5x-13y+6 x-y=-(2x+8y)-10-13x-12y=-116 14x-15y=-32-98x+2528y=54 415x+821y=-434x-7y+2=9x-8y+16=17x-11y+23