slope equation

B

byvonne

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Jun 22, 2009
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I have done many of these and I am confused with this one, can anyone help and explain so I can do it alone in the future.....

(r,2), (4,-6); slope =-8/3


I have tried many different sites nothing comes up with a definitive answer....again please explain and show steps so I can understand..

Thanks,
Byvonne
 
I would use \(\displaystyle y_2-y_1 = m(x_2-x_1)\).
Substitute in the known values and solve for r.

Or you could use \(\displaystyle m=\frac{y_2-y_1}{x_2-x_1}\).
 
byvonne said:
but how would i do that?
Click to expand...
\(\displaystyle m=\frac{y_2-y_1}{x_2-x_1}\)

\(\displaystyle -8/3=\frac{2+6}{r-4}\)

(3)(8)=(r-4)(-8)

Expand & reduce to solve r.
 
Aladdin has showed you the steps, to 8 / (r - 4) = -8 / 3

Are you saying you can't solve that for r?
If so, you need solving equations help from your teacher.
 
byvonne said:
I have done many of these and I am confused with this one, can anyone help and explain so I can do it alone in the future.....

(r,2), (4,-6); slope =-8/3


I have tried many different sites nothing comes up with a definitive answer....again please explain and show steps so I can understand..

Thanks,
Byvonne
Click to expand...

You don't tell us what the question is.

For all I know, answer is "42". :roll:
 
determine the value of r so that a line through the points with the given coordinates has given slope... draw a sketch of each situation
 
byvonne said:
determine the value of r so that a line through the points with the given coordinates has given slope... draw a sketch of each situation
Click to expand...

Now look at Aladdin's answer - and find 'r'....
 
i'm sorry it wasn't clicking in my head but i get it now thank you aladdin and subhotosh khan
sorry for the trouble
 
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