Wednesday, November 4, 2015

Find the real number m if the distance from the point(m, m+1) to the line 3x-4y-1=0 is 1.

We'll note the given point as A(m,
m+1).


We'll write the formula of the distance from a given
point to a given line:


d(A, line): |3*m - 4*(m+1) -
1|/sqrt[3^2 + (-4)^2]


But d(A, line) =
1


|3*m - 4*(m+1) - 1|/sqrt[3^2 + (-4)^2] =
1


(3*m - 4*(m+1) - 1)/sqrt(9+16) =
1


We'll multiply by sqrt 25 both
sides:


3m - 4m - 4 - 1 =
sqrt25


We'll combine like
terms:


-m - 5 = 5


We'll add 5
both sides:


-m = 10


m =
-10


The coordinates of the point A are: A(-10
, -9).

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