[tex]\begin{gathered} y=mx+b \\ \text{where} \\ m=\text{slope} \\ b=y-\text{intercept} \end{gathered}[/tex]
Let us find m
[tex]m=\frac{9-4}{22-12}=\frac{5}{10}=\frac{1}{2}[/tex]
Therefore,
[tex]\begin{gathered} 4=\frac{1}{2}(12)+b \\ 4=6+b \\ b=4-6 \\ b=-2 \end{gathered}[/tex][tex]y=\frac{1}{2}x-2[/tex]
