Sunday, May 3, 2015

Find the eqation of the line throught the point (5,-2) perpendicular to the line with the equation 3x-2y=5

We'll recall the fact that the product of the slopes of
two perpendicular lines is -1.


Therefore, we'll re-write
the given equation in the slope intercept form:


y = mx + n,
where m is the slope and n is the y intercept.


3x - 2y =
5


We'll isolate -2y to the left
side:


-2y = -3x + 5


We'll
divide by -2:


y = 3x/2 -
5/2


Comapring the equations, we'll get the slope m1 =
3/2


The slope of the perpendicular line is determined from
relation:


m1*m2 = -1


m2 =
-1/m1


m2 = -1/(3/2)


m2 =
-2/3


We'll write the point slope form of the equation of
the line:


y - y2 = m2*(x - x2), where x2 = 5, y2 = -2 and
m2 = -2/3


y - (-2) = (-2/3)*(x -
5)


y + 2 = -2x/3 + 10/3


y =
-2x/3 + 10/3 - 2


y = -2x/3 +
4/3


The equation of the line, which is
passing through the point (5,-2) and it is perpendicular to the line 3x - 2y = 5, is: y
= -2x/3 + 4/3.

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