Question 81688
The first thing you would do is solve each equation for y, so that you can get your equations into y = mx + b format (where m is your slope and b is your y-intercept).

Here's how you'd go about that:

3x + y = 6
3x - 3x + y = 6 - 3x
y = -3x + 6


3x - y = 0
3x - y + y = 0 + y
3x = y
or
y = 3x

Now, graph these two lines using their slopes and their y-intercepts and see where they intersect.  That point is your "solution."