Sera sells t-shirts at the beach. She believes the price of a t-shirt and the number of t-shirts sold are related. She has been experimenting with different prices for the t-shirts. She has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. The independent variable, which will go on the x-axis, is the . The dependent variable, which will go on the y-axis, is the