(1)x=5-3y 3x-6y=6 (2)m-3n=-5 5m+2n=26 用带入法解方程.

问题描述:

(1)x=5-3y 3x-6y=6 (2)m-3n=-5 5m+2n=26 用带入法解方程.

(1)把x=5-3y 代入3x-6y=6中消去x得:3(5-3y)-6y=6;即:15-9y-6y=6; -15y=-9; y=9/15=3/5;x=5-3y=5-9/5=16/5;所以圆方程组的解为:x=16/5; y=3/5;(2))m-3n=-5得:m=3n-5代入5m+2n=26中得:5(3n-5)+2n=26;15n-25+2n=26...