Finding Supply function/equation

For a certain commodity, the demand equation is given by

D = -5p + 50.

At a price of $1, twelve units of the commodity are supplied. If the supply equation is linear, and the market price is $4, find

the supply equation.

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...the supply curve (linear),
Supply at a price of $4 is 30 units
Supply at a price of $1 is 12 units

If we plot price on y axis and quantity on x axis, slope ...