III Joy washes dishes for t hours at a rate of 20 dishes per
hour. The total number of dishes washed, w, is
proportional to the number of hours she works.

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.