Question: How do you write an equation? (For graphing)?

Like how would I write, 3x+y=3 in an equation. That's just an example btw.

Relation Questions:

It's already an equation, because you're saying that something equals something.

In your example, you might want to reconfigure it by subtracting 3x from both sides. It would then look like this:

y = 3 - 3x

Then, if you're graphing it, you could get a bunch of "x" values and easily determine the corresponding "y" values. It would look like this:

http://www.wolframalpha.com/input/?i=y+%…

In fact, because the equation is "linear", you only need two x-y pairs. Plot them, then join them with a line that extends indefinitely in both directions.

–––––––––––––––––––––––

Here's some extra stuph for that spare half hour. :)
http://www.purplemath.com/modules/graphl…

–––––––––––––––––––––––

<edit> To get it into "y = mx + b" form, just rewrite y = 3 - 3x as follows:

y = -3x + 3

Note that "m" = slope of the line (in this case, -3)
"b" = y-intercept (in this case, 3)

–––––––––––––––––––––––

that is an equation? if you have two ordered pairs, put it into m=x2-x1/y2-y1. if you have slope and an ordered pair, you put the slope in for m and cross multiply