Monday, July 20, 2015

Write the slope-intercept equation for the line that passes through (-9, 9) and is perpendicular to -9x – 2y = 10 Please show all of your work.

This method will use y = mx + b to find the equation
instead of the point-slope method.


We are being asked to
find the equation of a line perpendicular to -9x -2y = 10 that passes through the point
(-9,9).


We will first find the slope of the perpendicular
line by transforming the given equation into slope-intercept form which is y = mx +
b.


-9x-2y = 10


-2y = 9x +
10


y = -9/2x - 5


The slope of
a line perpendicular to the given equation will be 2/9 which is the "opposite
reciprocal" of -9/2.


Now we will use direct substitution
into y = mx +b to find the y intercept of the new
equation.


y = mx + b


9 =
2/9(-9) + b


9 = -2 + b


11=
b


Now, write the equation in slope-intercept form using the
slope 2/9 and the y intercept 11.


The
equation of the line that is perpendicular to the given line and containing the given
point is y = (2/9)x + 11.

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