Good X is a normal good. Use indifference curves and budget lines to show the substitution and income effects of a price decrease for Good X. Put "expenditures on other goods" on the Y-axis, and clearly label all lines and curves. Make sure your diagram clearly shows the income effect and the substitution effect. Do the same thing for a typical inferior good and a Giffen good.
Give a short one or two sentence explanation of what the substitution effect means. Do the same for the income effect.