用代入法解方程组5x+3y=36,-x+9y=2
问题描述:
用代入法解方程组5x+3y=36,-x+9y=2
答
-x+9y=2,x=9y-2
代入5x+3y=36:
5(9y-2)+3y=36
48y=46
y=23/24
x=9*23/24-2=159/24