x,y满方程组3ax+4y=9 6ax+5y=27,那么3ax+y的值是?

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x,y满方程组3ax+4y=9 6ax+5y=27,那么3ax+y的值是?
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x,y满方程组3ax+4y=9 6ax+5y=27,那么3ax+y的值是?
x,y满方程组3ax+4y=9 6ax+5y=27,那么3ax+y的值是?

x,y满方程组3ax+4y=9 6ax+5y=27,那么3ax+y的值是?
3ax+4y=9 得-3ax-4y=-96ax+5y=27两式相加:3ax+y=27-9即3ax+y=18

两式子相减得结果18