umm... this is a werid question. there is mirror on the ground i think. i'll upload a photo of the graph. The bottom line is a mirror (sorry i have extremley bad handwriting+ tiny text.)http://i59.tinypic.com/2m0eix.jpg
here's the first question, too (sorry again for handwriting+backwards)http://i57.tinypic.com/mi1n9x.jpg
Basicly I can't use negitive numbers because the mirror will be reflecting all the lazers. if you want closer pictures of the questions i'll take them.
ok sorry if i get this wrong. i am not a math teacher and you may want to check my work.
equvilent equations means have the same varabiles, so solving for n will give you the answer.
lets get n by itself
take away 4 from both sides
add 6n to boths sides
subtract one from each side
solve left side
Divide both sides by 6
2.5=-2n(3n)+n divide both sides by 3 5/6=-2n(n)+n
divide both sides by -2 -5/12=n(n)+n lets name these n's 1,2, and 3 (for this step only) based on left to right order (easier to explain)
1 and 3 can be combined into 2n so you get
-5/12=2n(n) divide 2 from each side -5/24=(n)
That took a long time. i hope i'm correct. make sure to subisitute in -5/24 for n in the original problem