解方程组:1-0.3(y-2)=(x+1)/5,(y-3)/4=(4x+9)/20-1.5谢谢~~~~~~~~~~~~急~~~~~~~~~~过程也要!

问题描述:

解方程组:1-0.3(y-2)=(x+1)/5,(y-3)/4=(4x+9)/20-1.5
谢谢~~~~~~~~~~~~急~~~~~~~~~~
过程也要!

1-0.3(y-2)=(x+1)/5
化为x=7-1.5y
(y-3)/4=(4x+9)/20-1.5
化为x=1.25y+1.5连立解得
x=4
y=2