What points in the xy-plane satisfy the equations and inequalities in Exercises 11–12? Draw a figure for each exercise.

11. (9x2 + 4y2 - 36)(4x2 + 9y2 - 16) <=0

12. (9x2 + 4y2 - 36)(4x2 + 9y2 - 16) > 0

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