Posted by **AMY** on Friday, November 26, 2010 at 11:23am.

Write an equation of the the line containing the given point and perpendicular to the given line. (7,-5); 9x+7y = 3.

What I have so far. y-9=(1/9(x-3). Not sure after this.

- Algebra/equations -
**Reiny**, Friday, November 26, 2010 at 11:34am
First of all the new slope should have been 7/9.

Now you have to use the given point this way ...

y + 5 = (7/9)(x-7)

multiply each side by 9 (I don't like fractions in my equations)

9y + 45 = 7x - 49

-7x + 9y = -93

7x - 9y = 93

A quick way to do the above..

If Ax + By = C is the equation , then

the line Bx - Ay = K is perpendicular to it,

so

if 9x + 7y = 3 is given , then

7x - 9y = k is the perpendicular line

sub in the given point ...

7(7) - 9(-9) = c = 93

7x - 9y = 93 is your new line

- Algebra/equations -
**AMY**, Friday, November 26, 2010 at 12:59pm
thank u

## Answer this Question

## Related Questions

- Math 116 - 1.Write an equation of the line containing the given points and ...
- Math 116 - 1.Write an equation of the line containing the given points and ...
- Pre- Algebra - Given an equation of a line, how do I find equations for lines ...
- Writing this equation - how do I write the equation of a line perpendicular to ...
- Intermediate Algebra - Write an equation of the line containing the given point ...
- Algebra - graph the equation x-3=y (where do I plot the points?) find the ...
- Algebra - Write an equation of the line containing the given point and ...
- algebra - Write an equation of the line containing the given point and ...
- Math - Write an equation of the line containing the given point and ...
- algebra 116 - (3,5) 2x+y=3 .Write an equation of the line containing the given ...

More Related Questions