Question

急,求X.Y 3(x+10)=8y-50 5x=10y+40步骤越详细越好,

Answer 1

化为3x-8y=-50-30=-80.(1)

5x-10y=40.(2)

(1)*5-(2)*3得到：(15x-40y)-(15x-30y)=-80*5-40*3=-520

即：-10y=-520,y=52,将其代入(2)式,得：5x-10*52=40,5x=560,x=112,

所以x=112,y=52