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Line passing through the point (4,-7) and has slop of 3

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Aha! I love these types of questions. This is where you are going to use point-slope form!

As a reminder...point slope form is
y - y^1 = m(x-x^1)

So if we have our coordinates (4, -7) -- 4 would be
x^1 and -7 would be
y^1 -- now you need to plug them in.

But remember m = slope.

y + 7 = 3 (x - 4) -- now convert into standard form.

Standard form: y = 3x - 19

User Gargii
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