I am need help on the following questions: how does one find the indifference curve non numerically

A gym offers two contract options: (1) \"Rookie\": You pay $8 for each workout 07V). (2) \"Pro\": You pay a xed membership fee (M), but then you pay only $4 per workout 0V). Answer the following using graphically (no calculations required): a) Imagine that the gym charged a membership fee (M) so that you equally prefer the \"Rookie\" and \"Pro\" options. In an indifference curve diagram, nd the value of M (graphically, not numerically). [Hintz Put workouts ON) on the horizontal axis, and another good with price pG on the vertical axis. Assume an abstract income \"I\".] b) Using the concept of income and substitution effects, explain whether your consumption of workouts (W) would be larger, smaller, or the same under the \"Pro\" contract (continue to assume the membership fee M that makes you indifferent between the two options)