What is the constant of proportionality as shown in the graph? 17,70) Total Cost (in dollars) Boxed Lunches Ordered x and the total cost in dollars of the lunches u is represented by the graph below

Total cost in dollar of the lunches = y
Number of box lunches ordered = x
[tex]\begin{gathered} y=kx \\ \text{where} \\ k=\text{constant of proportionality} \\ x=17 \\ y=70 \\ 70=k\times17 \\ k=\frac{70}{17} \\ k=\frac{70}{17} \end{gathered}[/tex]