Answer: No
Step-by-step explanation:
We know that the equation for direct proportion between two quantities x ( independent variable) and y (dependent variable) is given by :-
[tex]y=kx[/tex] , where k is the proportionality constant.
if the relationship between the cost (dependent variable ) and the number of pizzas (independent variable ) is proportional, then k in the above equation remains constant for each row.
Let [tex]k=\dfrac{\text{Cost }}{\text{Number of pizzas}}[/tex]
1) [tex]k=\dfrac{12.50}{1}=12.50[/tex]
2) [tex]k=\dfrac{20}{2}=10[/tex]
But 10≠12.50, thus the value for k is not fixed.
Hence, the relationship between the cost and the number of pizzas is not proportional.
