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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