Question

Predict The cost of a school photo package includes $40 for the photo shoot, plus the

number of photos ordered multiplied by the price per photo. Is this situation defined by
a linear function? Predict the answer and then write and graph an equation on anothe
sheet of paper to check your prediction. You can use $2.50 or any other value as the cos
per photo

Answer 1

1. Linear; 2. C = 2.50x + 40

Explanation:

1. Prediction

Yes, it is a linear function, because each additional photo adds the same amount to the cost.

2. Equation

Let C = the cost of the photo package

and x = the number of photos

Then 2.50x = the cost of the photos

And $40 = cost of photo shoot

Then C = 2.50x + 40

The figure below shows that the graph of your equation is a straight line.