<p>I devote this thread to the math questions I find too hard to be self-explanatory. I'll be updating it daily (unless I suddenly become adept in SAT math, which is very, very unlikely).</p>

<p>The thread contains only HARD questions that APPEAR on the SAT.</p>

<p>And the first batch for today 08.02.2012:</p>

<p>1.A group of people were standing single file in a line to buy movie tickets.As Juan stood in the line , he noticed that there were 9 more people behind him than there were in front of him.He also noticed that the total number of people in the line was 3 times the number of people in front of him. </p>

<p>... I actually solved this as I was writing it..intially I made a mistake by frogetting to include Juan in the total number of people .. oh well, I'd be happy if someone sets up an equation for this.</p>

<p>2.In the xy-plane , a point with coordinates (a,b) lies on both of the lines y=2x+3 and y=1-3x . Which of the following equations must be true?</p>

<p>A) a = b

B) a=b+4

C) a=2b

D) a=2b+4

E) a=4-2b</p>

<p>This is a much simpler, straight on question.The problem is that I don't really get what am I actually searching for. I acknowledge that a should be something in terms of b and both should be substituted into both of the equations..but what's the desired result?Equations must be equal?Please explain.</p>