M$2-$I$3-$ Problem #$7$

a$.$ What is the approximate constant rate of change of $y$ with respect to $x$ for each linear function?

b$.$ Write a formula that expresses $y$ in terms of $x.($Hint$.$ use the constant rate of change $\frac{y}{}x$ you found in part a$)$

C$.$ Write a formula that expresses $y$ in terms of $x$ given the $y-$intercepts are $(0,3)$ for function $A,$ and $(0,-3)$ for graph B$.$