I need help with this HARD math problem.?

Question

It has 3 parts, i took a screenshot of it so I wouldn't risk messing something up when I typed it out. Any help would be greatly appreciated, thank-you.

http://www.scribd.com/doc/4987023/screenshot-11

Answer 1

6x-6y=-42

6y-6x=42

If you take the first equation and multiply it through by -1, you simply get the second equation.  This reduces to y-x=7 or y=x+7 (a line).

So, these equations are consistent (no contradictions), dependent

(since they are the same equation) and the solution is "infinitely many points" (all the points on the line which obey y=x+7 are solutions, e.g.

{0,7}  or {1,8}...there are an infinite number of solutions)

ANSWER