Question

将方程（2x+1）-（y+3）=x+y变形为用含x的算式表示y,并分别求当x=-2,0.1,2/5时相应的y的值

Answer 1

（2x+1）-（y+3）=x+y

2x+1-y-3=x+y

2x-y-2=x+y

2x-2-x=2y

2y=x-2

y=x/2-1

当x=-2,0.1,2/5时

y=-2,-0.95,-4/5