Homework Help: Math/Algebra do u know how to do slope intercept?

Posted by Chico on Thursday, March 26, 2009 at 6:31pm.

The following problems are in slope,point slope, and slope intercept forms of a line.

Could you check these thanks.

Find the slope intercept form of a line that passes through these two points (-4,4) and (2,1)

Answer: y= -1/2x-2

Find the slope intercept form of a line that is parallel to the line created in problem #1 and passes through the point ( -2,6)

Answer: y= -1/2x+4

Find the slope intercept form of a line that is perpendicular to the line created in problem #1 and passes through the point (1,3). What can you say about the relationship of this line and the line created in problem #2.

Answer: y= -1/2x+1/1/2
My response: I can say that is I used the same slope which is -1/2x

Math/Algebra do u know how to do slope intercept? - Damon, Thursday, March 26, 2009 at 6:40pm
two points (-4,4) and (2,1)
m = slope = (Y1-Y1)/(X2-X1)
= (1-4)/(2+4) = -3/6 = -1/2
then put either point in:
y = -(1/2) x + b
1 = -(1/2) 2 + b
1 = -1 + b
b = 2
so
y = -(1/2) x + 2
I think you have a sign error in your answer for b

if parallel, same slope = -(1/2)
y = -(1/2) x + b
now the point in
6 = -(1/2)(-2) + b
6 = 1 + b
b = 5
so
y = -(1/2) x + 5

then perpendicular
m = -1/-(1/2) = 2
s
y = 2 x + b
3 = 2(1) + b
b = 1
so
y = 2 x + 1
Math/Algebra do u know how to do slope intercept? - Damon, Thursday, March 26, 2009 at 6:41pm
By the way, you can always check the answers by seeing if all the points fit the line you come up with.
Damon thank you ()() - Alex, Thursday, March 26, 2009 at 6:47pm
Thank you very much you really Helped!
Math/Algebra do u know how to do slope intercept? - Alex, Thursday, March 26, 2009 at 6:52pm
I had the same homework to not like this but now I know how to do it thanks chico for posting a similar problem and thanks damon
Math/Algebra do u know how to do slope intercept? - Alex, Thursday, March 26, 2009 at 6:53pm
I had the same homework to not like this but now I know how to do it thanks chico for posting a similar problem and thanks damon
Math/Algebra do u know how to do slope intercept? - sydney, Tuesday, March 23, 2010 at 5:39pm
yo sup peops 2x - is y
-
Math/Algebra do u know how to do savle a algebra - inity, Monday, March 14, 2011 at 10:18pm
by - the two numbers and it gives you x or y or w
Math/Algebra do u know how to do slope intercept? - JASMINE, Tuesday, April 12, 2011 at 4:06pm
WHAT THE HECK IS ALLL THIS MESSS
Math/Algebra do u know how to do slope intercept? - ROCESLLLE, Tuesday, April 12, 2011 at 4:07pm
HOW WILL U DO THE MESS I DONT UNDERSTNAD IT!!!!!!!!! IGUESS

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