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2) a. Locate the bifurcation values for the one parameter family and draw phase lines for values of the parameters slightly smaller than and slightly larger than the bifurcation values. dy = y+ + ly dt b. Locate the bifurcation values for the one parameter family and draw phase lines for values of the parameters slightly smaller than and slightly larger than the bifurcation values. dy dt = (12 - 9) (12 -a)