3(x-1)=y+5①5(y-1)=3(x-1)+18②5(y-1)=y+5+185y-5=y+23y=73(x-1)=7+5x=5
3*x-3=y+5①3*x-3+18=5y-5②用①代入②y+5+18=5y-5y+23=5y-54y=28y=7代入①得到3x-3=7+53x-3=123x=15x=5所以x=5,y=7