Wait, so do these rules always apply? What if the x's coefficient is like, not 1? What if it was 2/3? Would these rules still apply?

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yes, they would, i think

It's not that the rules wouldn't apply, but it does add an extra "variation" to account for in the graph. You'll rarely see a coefficient other than 1 in a problem like this, but if you do it will affect both the center point of the v, as well as the width. Here's a great place to try it out... http://www.coolmath.com/graphit/. Type in abs( ) for the absolute value part of the function and put whatever you want inside. Go crazy !!