Question: What is the model constant when the dummy variable equals 1 in the following equations, where x1 is a continuous variable and x2 is a

What is the model constant when the dummy variable equals 1 in the following equations, where x1 is a continuous variable and x2 is a dummy variable with a value of 0 or 1?
a. y` = 4 + 8x1 + 3x2
b. y` = 7 + 6x1 + 5x2
c. y` = 4 + 8x1 + 3x2 + 4x1x2

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