Question

将方程x+y/2+3x-y/4=1变形为用含y的式子表示x,并求当y=-3、5、7/3时相应的x的值?

Answer 1

(x+y)/2+(3x-y)/4=1

2x+2y+3x-y=4

5x+y=4

x=(4-y)/5

当y=-3时,y=7/4

当y=5时,y=-1/3

当y=7/3时,y=1/3