how many people do you need to gather to be sure that at least two of them have birthdays in the same month?
2 answers:
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I find it simplest to convert to standard form, find the perpendicular, convert back.
For standard form we move the x term to the left side:
The perpendiculars are given by swapping the x and y coefficients, negating one. The right side is directly determined by the point (-2,7):
Solve for y for point slope form:
That's the answer.