60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个

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60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个
60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个怎么接出来的x.y值

60+(1.5x-10)y=109.5∴ (1.5x-10)y=49.5 ③60+(x-10)y=78∴ (x-10)y=18 ④③:④得(1.5x-10):(x-10)=49.5:1818 (1.5x-10)=49.5 (x-10)27x-180=49.5x-495315=22.5x解得,x=14代入④中,解得y=4.5...