0.3(y-2)+1=x+2/5
两边乘10
3y-6+10=2x+4
2x-3y=0 (1)
y-3/20-x+3/5=1
两边乘20
y-3-4x-12=20
y=4x+35
代入(1)
2x-12x-105=0
x=10.5
y=4x+35=77