{3x+5y=18 {2x+3y=10

问题描述:

{3x+5y=18 {2x+3y=10

{3x+5y=18 -----------(1)
{2x+3y=10-----------(2)
(1)*2-(2)*3
10y-9y=36-30
y=6
把y=6代入(1)
3x+5*6=18
x=-4