250. Coordinated triangle



In the diagram is the graph of linear equation y = x + 4 containing two points, P(–3, 1) and Q(4, 8).

Point R(x, 0), located on the x-axis, is such that it can move between points S(–3, 0) and T(4, 0).  Define y as the area of △PRQ.  Answer the following:

⒜* Express y in terms of x.
⒝  Determine the range of values of y.
⒞  Given y = 10, determine the coordinates of point R.

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