The function y = 1.5x + 9 represents the cost y (in dollars) of a large pizza with a toppings, where x is equal to 1, 2, or 3.

Identify the independent and dependent variables, the domain, and the range.

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independent variable = x, Dependent variable = y, Domain = {1,2,3}, Range = {10.5, 12, 13.5}

Step-by-step explanation:

Given :  function y = 1.5x + 9 represents the cost y (in dollars) of a large pizza with a toppings, where x is equal to  1, 2, or 3.

here , independent variable = x  (Number of toppings on with cost is dependent)

Dependent variable = y

Domain = Set values of x = {1,2,3}

At x =  1 , y = 1.5+9 = 10.5

At x= 2 , y=  1.5(2) + 9 = 12

At x= 3,  y = 1.5(3) + 9 = 13.5

Range = set of values of y = {10.5, 12, 13.5}