Katie purchased a new car for $27,599. This make and model straight line depreciates for 13 years. 1. Identify the coordinates of the x- and y-intercepts for the depreciation equation. Determine the slope of the depreciation equation. y-intercept: (0, maximum car value) x-intercept: (maximum lifespan, 0) y-intercept: x-intercept: ΔΧ = Slope ratio Ду 27.599-0 Slope ratio = 0-13 Katie's new car depreciates at a rate of a year. 2. Write the straight line depreciation equation that models this situation. Draw the graph of the straight line depreciation equation. m=slope = = b=y-intercept (original price of car) = y=mx + b y=_ xt Use the Y=function of the graphing calculator to create the graph.