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

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I used to use things like "y=mx+b", " "y2-y1/x2-x1", "slopemx", different things like that. The money thing really helped me too. My mom was merciless with it, as I wanted her to be lol. After a couple missed hang out opportunities with friends due to my lack of money, I had my formulas down pat.

I might talk to my grandfather about doing this

Thanks for the reply.