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My first question is about a formula for the y intercept of a linear equation, given you know two points that the line goes through. I Googled but no luck - it's hard to type a formula into Google.

The formula is: b = (y1*x2 - y2*x1)/(x2 - x1)

The textbook author left this as an "exercise" to derive, but I don't understand where it comes from.

<Second question moved by mentor to its own thread -- https://www.physicsforums.com/threads/a-question-i-have-about-my-l-a-textbook-2.949215/>

Thanks.

The formula is: b = (y1*x2 - y2*x1)/(x2 - x1)

The textbook author left this as an "exercise" to derive, but I don't understand where it comes from.

<Second question moved by mentor to its own thread -- https://www.physicsforums.com/threads/a-question-i-have-about-my-l-a-textbook-2.949215/>

Thanks.

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