{1.5x+1.5y=210,①
{2x+9/8y=210.②
由① *2-②*1.5得
3x+3y-3x-1.5*9/8y=210*2-210*1.5
1.5(2-9/8)y=210*0.5
(7/8)y=210*0.5/1.5
y=70*8/7
y=80
将y=80代入 ①得
x=60