I know this sounds simple, but my friend insists this is a problem in his textbook, and I can't solve it:(adsbygoogle = window.adsbygoogle || []).push({});

"Give the equation in standard form ax+by=c of the line through the points (2, -1) and (4,6)"

Don't you need one point for every variable? Isn't the standard form y = mx + b?

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# Tricky problem

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