R(-12, 8), S(6, 12)

\(\Large R(-12,8), S(6,12)\)

 

\(m=\frac{y_S-y_R}{x_S-x_R}=\frac{12-8}{6-(-12)}=\frac{2}{9}\)

 

\(\Large y=f(x)=mx+b\)

 

\(S:y_S=m\times x_S+b\)

 

\(S: 12=\frac{2}{9}\times 6+b\)

 

\(b=12-\frac{9\times 6}{9}=6\)

 

\(\Large y=f(x)=\frac{2}{9}x+6\)

 

  !

.