Answer:
[tex]\huge\boxed{D.\ x=2}[/tex]
Step-by-step explanation:
[tex]f(x)=-3x+5\\\\f(x)=-1[/tex]
substitute
[tex]-3x+5=-1[/tex] subtract 5 to both sides
[tex]-3x+5-5=-1-5[/tex]
[tex]-3x=-6[/tex] divide both sidesa by (-3)
[tex]\dfrac{-3x}{-3}=\dfrac{-6}{-3}\\\\x=2[/tex]
