we can see that
curve is a straight line
y-axis is price(p)
x-axis is number of glasses (x)
so, firstly we will find slope
we can select any two points
(0,0) and (2,9)
x1=0, y1=0 , x2=2 , y2=9
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
now, we can plug values
[tex]m=\frac{9-0}{2-0}[/tex]
[tex]m=\frac{9}{2}[/tex]
now, we can use point slope form of equation
[tex]y-y_1=m(x-x_1)[/tex]
so, we can plug it
[tex]y-0=\frac{9}{2}(x-0)[/tex]
[tex]y=\frac{9}{2}x[/tex]
now, y is p
so, we get our equation as
[tex]p=\frac{9}{2}x[/tex]................Answer
