x/2+y/3=2 2x+3x=28

问题描述:

x/2+y/3=2 2x+3x=28

题目应该是:
x/2+y/3=2 ①
2x+3y=28 ②
②-①×4得:3y-4y/3=20
5y/3=20
y=12
将y=12代入②中得:2x+36=28
x=-4
∴ x=-4
y=12