I need help on math homework, I'm not asking you to do it for me just help. Math is my worst subject but it says to choose the equation of the line passing through the point (1,-5) and perpendicular to y=1/5 x -10. A. y= 5x + 10 B. y=5x C. Y= -5x -10 D. y= -5x
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jimthompson5910 (jim_thompson5910):
The slope of y=1/5 x -10 is what?
jimthompson5910 (jim_thompson5910):
If you're not sure, then remember that y = mx+ b is the general form where m is the slope
ex: y = 3x + 5 has a slope of m = 3
ex: y = 1/9x - 10 has a slope of m = 1/9
OpenStudy (anonymous):
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OpenStudy (anonymous):
I'm so confused
OpenStudy (anonymous):
i love u
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jimthompson5910 (jim_thompson5910):
what's the number in front of the x variable
jimthompson5910 (jim_thompson5910):
in the equation y=1/5 x -10
OpenStudy (anonymous):
1/5 right?
jimthompson5910 (jim_thompson5910):
so the slope of y=1/5 x -10 is 1/5
jimthompson5910 (jim_thompson5910):
to find the perpendicular slope, you flip the fraction to get 5/1 = 5
then you flip the sign to get -5
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jimthompson5910 (jim_thompson5910):
so the perpendicular slope is -5
jimthompson5910 (jim_thompson5910):
this means your answer will have a slope of -5
OpenStudy (anonymous):
im attracted to you
jimthompson5910 (jim_thompson5910):
so
y = mx+b
y = -5x + b ... plug in the perpendicular slope
-5 = -5(1) + b ... plug in x = 1 and y = -5
-5 = -5 + b
solve for b and tell me what you get
OpenStudy (anonymous):
So the answer is B?
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OpenStudy (anonymous):
yes it is
jimthompson5910 (jim_thompson5910):
close, but notice that the slope is negative
jimthompson5910 (jim_thompson5910):
no the answer isn't B
OpenStudy (anonymous):
jk i knew that. i love you
jimthompson5910 (jim_thompson5910):
ok you need to either help or get out bobby, this is for math only
save that for the chat or private messaging
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jimthompson5910 (jim_thompson5910):
or better yet, do it on facebook
OpenStudy (anonymous):
okkk screw me then
OpenStudy (anonymous):
its D right?
jimthompson5910 (jim_thompson5910):
yes it's y = -5x
jimthompson5910 (jim_thompson5910):
-5 = -5 + b
-5+5 = -5 + b + 5
0 = b
b = 0
so
m = -5
b = 0
----------
y = mx + b
y = -5x + 0
y = -5x
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OpenStudy (anonymous):
omg thank you so much! <3 i kinda understand it
jimthompson5910 (jim_thompson5910):
ok just keep practicing it and you'll get much better at it