book Maths Puzzle Numerical Ability

P,Q and R are points with coordinates (2,3), (4,9) and (10,-3) respectivley.
Find (a) The equation of the altitude PS.
(b) The area of triangle PQR

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is any one out their that can help me with this problem a.s.a.p i would really apprecate it. translate the difference between twelve times a number and the number into a mathematic everyone alwasy shows the main steps in quadratic equations.. but what do you do when it comes to reducing?? here is one of my questions..x2(x squared)-8x-3=0