y = a + bx. where y is the dependent variable and x is the independent variable. In this case, the slope is equal to b and a is the intercept. When plotted on a graph, y is determined by the value of x. Regression equations are charted as a line and are important in calculating economic data and stock prices.
I just took a prom dress to be dry cleaned and they are charging $25.00.
Getty Images. The cost of going to prom -- the perfect dress or tuxedo, a limo, and pre-dance festivities -- has risen to a nationwide average of $1,139.