Posted by **Tim** on Sunday, January 17, 2010 at 9:01am.

Give the equation of a line perpendicular to the line y = 4x having the same y-intercept.

- Math -
**bobpursley**, Sunday, January 17, 2010 at 9:06am
we won't do your homework or tests for you. We will critique your work.

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**Tim**, Sunday, January 17, 2010 at 9:10am
I don't even know where or how to start.Im lost on these.

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**bobpursley**, Sunday, January 17, 2010 at 9:14am
This is a test your teacher gave you. If you don't know where to start, you need to fail it. Getting answers from others will just put you in a deeper hole. Discuss this situation with your teacher.

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**Reiny**, Sunday, January 17, 2010 at 9:17am
The series of questions you asked are routine questions.

If you are finishing a semester and are reviewing for exams, you should know how to do these.

For the above question,

- how are slopes of perpendicular lines related ?

- what point is associated with the y-intercept of an equation of the form

y = mx + b ?

- Math -
**drwls**, Sunday, January 17, 2010 at 11:47am
The y intercept of your y = 4x line is zero, and since the second line also has that y intercept, both lines must go through the origin (0,0).

The product of the slopes (m) for the two lines must be -1, if they are perpendicular. The first line has a slope of 4. You should be able to figure out the rest of it.

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