This is from an assignment I need to finish but I need some **advice** on where/what  to investigate further please (absolutely new to stats):

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You use regression to generate a function that operates on two variables (`X1` and `X2`) to predict a label (`Y`).

The regression output shows the following coefficients:

    Intercept: 12.576
    X1: 2.32
    X2: -1.3

Which formulae describes the regression function?

    Y = 12.567 + 2.32 + -1.3
    Y = 12.567 x (X1 x 2.32) + (X2 x -1.3)
    Y = 12.567 + (X1 + 2.32) + (X2 + -1.3)

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My thinking : 

    sample regression line is: ŷ = b0 + b1x.

    thus : y = 12.576 + (regression coefficient)

    and regression coefficient = y = mx + b


I am out of my depth - please advise
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  [1]: https://i.sstatic.net/jwFWC.png