Tough and Tricky questions: Coordinate Geometry.
Line L contains the points (2,3) and (a,q). If q = 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 options:	A) 2x + y = ax + 7	B) 2x + y = –ax	C) x + 2y = ax + 7	D) y – 7 = x ÷ (a – 2)	E) 2x + y = 7 – ax
we need m=a-2, so we should gety=mx+bform in answer choices   (A) 2x+y=ax+7 =&gt; y=ax-2x+7 =&gt; y=x(a-2)+7. It is what we need   (B) 2x + y = –ax =&gt; y=-px-2x =&gt; y=x(-a-2). Wrong   (C) x + 2y = ax + 7 =&gt; y=x(a-1/2)+7/2. Wrong   (D) y – 7 = x ÷ (a – 2) =&gt; y=(1/a-2)x+7. Wrong   (E) 2x + y = 7 – ax =&gt; y=-ax-2x+7 =&gt; y=x(-a-2)+7. Wrong   2x + y = ax + 7=answer
<result>A</result>
Tough and Tricky questions: Coordinate Geometry.
Line L contains the points (2,3) and (a,q). If q = 2, which of the following could be the equation of line m, which is perpendicular to line L?