y = mx + b , point slope formula, y2 - y1 over x2 - x1

[Whizdom™]

For me, I found those the easiest to remember. Repetition helps. When you are faced with a graph, use your formulas. I used to also use them as my passwords for things when I was in school and trying to remember. Also have someone in your house hold on to your extra money. Then have it set up for it to be that you have to recite your formulas before you are awarded with your money.