y=0.75x 7.5x-7x=0.75x+3.14
5x=7.5x+31.4
-2.5x=31.4
10 y-2.5x=31.4+10y
10y-5x=31.4
x=125.6
125.6×0.75=94.2 125.6-94.2=31.4