Graph y versus x1 for x 2 = 1, 2, and 3 for each of the following

Question:

Graph y versus x1 for x2 = 1, 2, and 3 for each of the following equations.

a. y = 1 + 2x1 + 4x2

b. y = 1 + 2x1 + 4x2 − x1x2

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