So for this equation you will want to graph the points (5,-2) and (8,4). I have taken the liberty of doing the graph for you.
With this I have put the two dots on the 2 locations they wanted. So then what you need to do is draw a straight line from dot one to dot two.
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to convert from polar to rectangular form use
• cosΘ =
• r² = x² + y²
r = 8 × ( multiply both sides by r )
r² = 8x, hence
x² + y² = 8x ← in rectangular form
3*9=4x+12
27=4x+12
4x=27-12
4x=15
x=3.75