{3x+5y=18 {2x+3y=10
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{3x+5y=18 {2x+3y=10
{3x+5y=18 {2x+3y=10
{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
x=-4 y=6
3x+5y=18
2x+3y=10
1式乘以2-2式乘以3
10y-9y = 18*2-10*3
y = 6
代入2式
2x+3*6=10
2x=-8
x=-4
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