If x is the number of years since 1980 and y is the number of microcomputers in automobiles, then x and y can be related by 200x 100y 54. 1. Write the model equation in slope-intercept form and determine the slope of the graph. Is this an example of direct variation? 2. What does the slope represent? 3. Solve the equation when x = 6 and interpret your results. 4. Predict the number of microcomputers in automobiles in 2010