Write the equation of the line that is perpendicular to the line 3x + y = 7 and passes through the point (6, -1).

Question

waheguru · Answer

Do you know how to solve this?

anonymous · Answer

nooo im soo lost

waheguru · Answer

What don't you understand

anonymous · Answer

i dont understand how to solve it. its been a long time since i did algebra and i cant remember how to do it

waheguru · Answer

Lets Do this step by step
Do you know parallel and perpendicular lines ?
And how the slope change in relation to each

waheguru · Answer

When a line is parallel to a line then the slope stays the same |dw:1343935655688:dw|
Here as you can see the lines will never meet because the slopes are the same althought the y intercepts can be different, even if the slopes were 2 for the first line and 1.9 for the second they wound not be parallel
*When a line is parallel to another line the slope is the same 

Perpendicular lines intersect at 90 degrees and for that to happend the slope must be the opposite reciprocal so if a line is parallel to 1/2, we find the reciprocal which is 2/1 and change it from a positive to negative so it becomes -2/1

Do you get this much

waheguru · Answer

Sorry I meant to say when a line is perpendicular for the second paragraph

anonymous · Answer

yes

anonymous · Answer

oh okay

waheguru · Answer

3x + y = 7 
Here you need to find the equation of the line which is perpendicular to this equation so right of the bat we need to make this in to y=mx+b format right so we can get the slope 
Do you know how to change it in to y=mx+b format?

waheguru · Answer

Convert 3x + y = 7 in to y=mx+b @drakelovermel

anonymous · Answer

i sorta forgot. please refresh my memory

waheguru · Answer

This is algebra
3x + y = 7
you need to isolate y amd move everythin g on the right side
y=-3x+7

waheguru · Answer

Do you understand

anonymous · Answer

yes

waheguru · Answer

Now what is the perpendicular slope to -3x?

anonymous · Answer

was it y=3x+7

waheguru · Answer

No we moved it so it became negative

anonymous · Answer

ohh okay i got you

waheguru · Answer

So...

anonymous · Answer

okay so whats to learn next?

waheguru · Answer

What is the perpendicular slope to -3x.

anonymous · Answer

heyy thanks for the help! you where very helpful but i have to go eat and my mom is calling me soo im soo srry but i got to go. but thanks!!!

waheguru · Answer

Np!

anonymous · Answer

http://www.algebra.com/algebra/homework/Linear-equations/Linear-equations.faq.question.388924.html

anonymous · Answer

thank you soo much!