Find the Slope-Intercept Form of the Equation of a Line $f(1)=6, f(-3)=6$

Multiple Choice

Find the slope-intercept form of the equation of a line that passes through the given points.
- $f(1) =6, f(-3) =6$

A) $f(x) =1$
B) $f(x) =3 x$
C) $f(x) =\frac{1}{3} x$
D) $f(x) =6$