SI. 3 Find $c$ so that the graph of $y=m x+c$ passes through the two points $(b+4,5)$ and $(-2,2)$.
The 2 points are: $(4,5)$ and $(-2,2)$. The slope is $\frac{5-2}{4-(-2)}=\frac{1}{2}$. The line $y=\frac{1}{2} x+c$ passes through $(-2,2): 2=-1+c$ $\Rightarrow c=3$