1. Introduction to Macroeconomics Chapter 1 Appendix. Working with Numbers and Graphs

2. Chapter 1 Appendix Working with Numbers and Graphs Working with Numbers –Marginal Change and Analysis –Percentage Change –Elasticity Working with Graphs –Relating Two Variables –Graphical Representation –Graphing an Equation –The Intercept of a Curve –The Slope of a Curve –Nonlinear Relationships

3. Graph Plotting Area

4. Graphing an Equation Y = 10 + 0.75 * X Slope = 0.75 = change in Y (rise) change in X (run) Intercept = 10 = value of Y when X equals 0

5. Slopes Positive Slope (slope > 0) X and Y are directly related Negative Slope (slope < 0) X and Y are inversely related Zero Slope (slope = 0)Undefined Slope (slope =  )

6. Nonlinear Relationship: Study Time and Expected Grade Slope of Tanget (at X=4) = + 8.6 Positive Slope Slope becomes zero at maximum Negative Slope