Answer :
[tex]\begin{gathered} \text{Given data} \\ \text{slope}\Rightarrow m=-3 \\ \text{points}\Rightarrow x_1=4,y_1=10 \\ \text{The equation of line is, } \\ y-y_1=m(x-x_1) \\ y-10=-3(x-4) \\ y-10=-3x+12 \\ y=-3x+22 \end{gathered}[/tex]