设变量x,y满足约束条件x-y>=0,x+y=1,则目标函数Z=3x+y的最大值为多少?我想知道这种类型的题可以不通过画图的方式来解吗?

设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2 设变量x,y满足约束条件:x-y+3>=0 x+y>=0 -2 设变量x,y满足约束条件x-y>-1,x+y>1,3x-y 设变量x,y满足约束条件x-y>=-1,x+y>=1,3x-y 设变量x,y满足约束条件 {x-y≥0,x+y≤1,x+2y≥0},则函数Z=2x+y 的最大值? 设变量x,y满足约束条件 {x-y≥0,x+y≤1,x+2y≥0},则函数Z=2x+y 的最大值? 设X,Y满足约束条件X+Y 已知变量x,y满足约束条件1 设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3 已知变量x,y满足约束条件x+2y-3=0,y-1 若变量x,y满足约束条件｛y=0,x-y-2 若变量x,y满足约束条件｛y=0,x-y-2 已知变量x,y满足约束条件x+2y-3=0,y-1 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 设变量x y满足约束条件x-y≥-1 x+y≥1 2x-y≤1 z=(x-2y)/(x+y)的最大值 设x,y满足约束条件x>=0 x>=y 2x-y 设x,y满足约束条件{x>=0,y>=x,4x+3y 设x,y满足约束条件x>=0 y>=x 4x+3y