# C if income increases to 6000 with p y at 20unit then

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(c) If income increases to \$6000, with P Y at \$20/unit, then what is X D as a function of P X alone? Write the equation in two ways: in the form X D + bP X and in the form P X = c + dX D . (d) Sketch a graph of your answers to (a), (b), and (c), with X on the horizontal axis and P X on the vertical axis. 6. Suppose that X D = 38 – P X – 0.05 P X P Y – 0.4 P Y + 2 M , with units the same as in ques- tion 5. (a) If P Y = \$20/unit and income is \$10,000, then what is X D as a function of P X alone? Write the equation in two ways: in the form X D + bP X and in the form P X = c + dX D . (b) If P Y becomes \$10/unit, with income still \$10,000, then what is X D as a function of P X alone? Write the equation in two ways: in the form X D = a + bP X , and in the form P X = c + dX D . M1-10 MATH MODULE 1: FUNCTIONS, GRAPHS, AND THE COORDINATE SYSTEM
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