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## Main Question or Discussion Point

Perpendicular to y = -1/4x - 12 passing through (3, -4).

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Perpendicular to y = -1/4x - 12 passing through (3, -4).

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Math Is Hard

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Hint: If two lines are perpendicular, what does this tell you about their slopes?

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They intersect?

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the slope of the second line will be the opposite reciprocal of the first slope.

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opposite reciprocal?

:P

I prefer to use the term negative reciprocal.

:P

I prefer to use the term negative reciprocal.

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so if the slope of a line is -1/4, then the slope of a line that is perpendicular to it would be...?

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my maths teacher had a strange way of explaining things...

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so you can see it by setting -1=m1*m2 where m1 or m2 to -1/4.

do you need help finding the whole equation based on that slope and point? you can just plug an x and a y into the y=mx+b way and solve for b too.

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