Wednesday, January 1, 2014

`(-2, 6), y = -x + 5` Find the distance between the point and the line.

Take note that the formula to determine the distance from a point `(x_o, y_o)` to a line Ax+By+C=0 is:


`d = |Ax_o + By_o +C|/sqrt(A^2+B^2)`



To apply, set one side of the given equation equal to zero.


`y=-x+5`


`x+y-5=0`


Then, plug-in the coefficients of x and y, as well as the constant to the formula.


`d=|1x_o + 1y_o + (-5)|/sqrt(1^2+1^2)`


`d=|x_o + y_o - 5|/sqrt2`


And, plug-in the given point (-2,6).


`d=|-2 + 6 - 5|/sqrt2`


`d=|-1|/sqrt2`


`d=1/sqrt2`


`d=1/sqrt2*sqrt2/sqrt2`


`d=sqrt2/2`


Therefore, the distance between the point (-2,6) and the line y=-x+5 is `sqrt2/2` units.

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