Tough and Tricky questions: Coordinate Geometry.
Line L contains the points (2,3) and (p,c). If c = 2, which of the following could be the equation of line m, which is perpendicular to line L?	Choose the correct choice from the following answers
A) 2x + y = px + 7 B) 2x + y = –px C) x + 2y = px + 7 D) y – 7 = x ÷ (p – 2) E) 2x + y = 7 – px
So we need m=p-2, so we should get y=mx+b form in answer choices   (A) 2x+y=px+7 =&gt; y=px-2x+7 =&gt; y=x(p-2)+7. It is what we need   (B) 2x + y = –px =&gt; y=-px-2x =&gt; y=x(-p-2). Wrong   (C) x + 2y = px + 7 =&gt; y=x(p-1/2)+7/2. Wrong   (D) y – 7 = x ÷ (p – 2) =&gt; y=(1/p-2)x+7. Wrong   (E) 2x + y = 7 – px =&gt; y=-px-2x+7 =&gt; y=x(-p-2)+7. Wrong   2x + y = px + 7
<result>A</result>
Tough and Tricky questions: Coordinate Geometry.
Line L contains the points (2,3) and (p,c). If c = 2, which of the following could be the equation of line m, which is perpendicular to line L?