graphing linear equations.....?

Question

Compare equations with one variable to equations with two variables. How are they alike? How are they different?

Answer 1

I assume that this is what you are talking about.
one variable as in y=a
two variables as in y=ax+b

One variable is always vertical (undifined slope), or horizontal (slope = 0).
y=a is always horizontal
x=a is always vertical

Two variables is when you will find a slope. If your equation is in slope-intercept form (y=ax+b), a is your slope, and b is you y-intercept.
in this form you will always have a straight line unless you have an exponential value, then you have a parabola, and an absulute value lookes like a "V"

hope this helps, if you want more just ask, I know a lot more. Just didnt want to get too complicated as I have no idea what level of algebra you are in. I am assuming alg I.