The Gompertz equation, which models growth of animal tumors, is y' = −ay ln(y∕b), where a and b are positive constants. Use Figures 9.25 and 9.26 to write a paragraph describing the similarities and/or differences between solutions to the Gompertz equation with a = 1 and b = 2 and solutions to the equation y' = y(2 − y).

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+ 2 + a 2 Figure 9.25: Slope field for y=-y ln(y/2) 2 X X 2 Figure 9.26: Slope field for y' = y(2-y)