Given:
The graph show relationship between the length of hallway Denise covers in tiles (x)
And the number of tiles needed (y)
AS shown: the relation begins from the point (0,0)
And the relation is linear
so, the relation between x and y are proportional
So, the answer is yes
Now, we need to get the relation:
The general form of the proportional relationship is : y = kx
So, using one point from the line to get the value of k
so, the line passing through the point ( 4 , 20 )
when x = 4 , y = 20
so,

So, the relation between x and y is :

So, the constant is 5