SOLUTION: Write the standard form equation of the line that is perpendicular to 6x - 7y - 1 = 0 and passes through (0, -2).

Algebra ->  Linear-equations -> SOLUTION: Write the standard form equation of the line that is perpendicular to 6x - 7y - 1 = 0 and passes through (0, -2).      Log On


   



Question 1181493: Write the standard form equation of the line that is perpendicular to
6x - 7y - 1 = 0 and passes through (0, -2).

Found 2 solutions by MathLover1, greenestamps:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Write the standard form equation of the line that is perpendicular to
6x+-+7y+-+1+=+0 and passes through (0, -2).
first write 6x+-+7y+-+1+=+0 in slope intercept form
6x-1+=7y+
y=%286%2F7%29x-1%2F7+=> a slope is m=%286%2F7%29
the line that is perpendicular to given line is negative reciprocal to m=%286%2F7%29
m%5Bp%5D=-1%2F%286%2F7%29
m%5Bp%5D=-7%2F6

use slope point formula to find equation of the line that is perpendicular to given line
y-y%5B1%5D=m%5Bp%5D%28x-x%5B1%5D%29........substitute a slope, and coordinates of given point (0, -2)

y-%28-2%29=-%287%2F6%29%28x-0%29

y%2B2=-%287%2F6%29x

y=-%287%2F6%29x-2-> write it in standard form ax%2Bby=c
y=-%287%2F6%29x-2.......both sides multiply by 6
6y=-7x-12
7x%2B6y=-12












Answer by greenestamps(13216) About Me  (Show Source):
You can put this solution on YOUR website!


Especially if you are just learning basic algebra, you should understand how to solve the problem as shown by the other tutor:

determine the slope of the given line;
determine the slope of the line perpendicular to the given line; and
find the equation of the line with that slope passing through the given point.

Here is a more advanced method that is faster and easier.

Any line parallel to the given line 6x-7y-1=0 will have an equation in standard form of 6x-7y+C=0, where C can be any constant (the coefficients of x and y will be the same as in the given equation).

Any line perpendicular to the given line 6x-7y-1=0 will have an equation in standard form of 7x+6y+D=0, where again D is some constant. Note to get that form, the coefficients of x and y switch places, and one of them changes sign.

Use that form and the given point (0,-2) to determine the constant.

7(x)+6(y)+D=0
7(0)+6(-2)+D=0
-12+D=0
D=12

ANSWER: 7x+6y+12=0