Question: How do I find a linear function on Maple

The question reads as follows: 

a) Use Maple to find the linear function f(x,y) = c +mx + ny, whose graph passes through the points P=(5,1,0), Q=(-1,7,1), and R = (2,1,4). 

b) Use Maple to graph the linear function whose formula you found in part a.

c) Use Maple to find the (exact) area of the triangle having P,Q and R as vertices. 

Thank you so much. I am new to Maple and just trying to figure it all out.  

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