Y=a-b/(x+c)
*************
0=a-b/(50+c)
0,8=a-b/(74+c)
2,3=a-b/(326+c)
******************
a=b/(50+c)
0,8=b/(50+c)-b/(74+c)
2,3=b/(50+c)-b/(326+c)
******************
a=b/(50+c)
0,8*(74+c)*(50+c)=b*(74+c)-b*(50+c)
2,3*(326+c)*(50+c)=b*(326+c)-b*(50+c)
******************
a=b/(50+c)
0,8*(74+c)*(50+c)=b*24
2,3*(326+c)*(50+c)=b*276
******************
a=b/(50+c)
b=0,8*(74+c)*(50+c)/24
2,3*(326+c)*(50+c)=276*0,8*(74+c)*(50+c)/24
******************
a=b/(50+c)
b=0,8*(74+c)*(50+c)/24
23*24*(326+c)=276*8*(74+c)
******************
c=(276*8*74-23*24*326)/(23*24-276*8)=10
b=0,8*(74+c)*(50+c)/24=0,8*(74+10)*(50+10)/24=
168
a=b/(50+c)=168/(50+10)=2,8
*******************
y=a-b/(x+c)=2,8-168/(x+10)
y=2,8-168/(x+10)
при х = 158 у=2,8-168/(158+10)=1,8 - это ответ