anonymous
  • anonymous
please help i will reward 2 medals
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
What do you need help with?
anonymous
  • anonymous
ok A line passes through (3, 7) and (6, 9). Which equation best represents the line? y = 3 over 2x + 5 y = 2 over 3x + 5 y = 3x + 2 y = 2 over 3x + 2
anonymous
  • anonymous

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anonymous
  • anonymous
Did you try substituting the points in the equations?
anonymous
  • anonymous
no
anonymous
  • anonymous
but i dont get how to do that
anonymous
  • anonymous
Alright, I'll explain.
anonymous
  • anonymous
thanks btw
anonymous
  • anonymous
TheRaggedyDoctor
  • TheRaggedyDoctor
You can't give out two medals, btw..
anonymous
  • anonymous
yes i can
TheRaggedyDoctor
  • TheRaggedyDoctor
No you can't.
TheRaggedyDoctor
  • TheRaggedyDoctor
You can only give out one.
anonymous
  • anonymous
i can start a new convo with nothing
anonymous
  • anonymous
I'll do the first for you. So 3 is the x value, and 7 is the y. y = 3/ (2x + 5) which is (7) = 3/ (2(3) +5) So as you can see we are basically substituting the numbers in the place of x and y. And to solve... 7 = 3 /11 We do the same for the other coordinate (6,9) 9 = 3 (2(6) + 5) 9 = 51 They aren't the same. Both sides of the equation must be equal.
anonymous
  • anonymous
Those two points aren't on the same line.
anonymous
  • anonymous
ok so its b? if i am understanding @ShizukaTheOtaku
anonymous
  • anonymous
anonymous
  • anonymous
How did you get that answer?
anonymous
  • anonymous
i did what you said and i got b
anonymous
  • anonymous
i am guessing it is wrong
anonymous
  • anonymous
By over do you mean 3 / (2x + 5) ?
anonymous
  • anonymous
yea
anonymous
  • anonymous
Actually I'm completely stumped now because the rule I know doesn't seem to apply here. Maybe you can tag someone else who knows? Sorry for not being able to help.
anonymous
  • anonymous
np u tried
anonymous
  • anonymous
anonymous
  • anonymous
anonymous
  • anonymous
anonymous
  • anonymous
anonymous
  • anonymous
A line passes through (3, 7) and (6, 9). Which equation best represents the line? y = 3 over 2x + 5 y = 2 over 3x + 5 y = 3x + 2 y = 2 over 3x + 2
anonymous
  • anonymous
over means /
anonymous
  • anonymous
so no one knows what to do?
anonymous
  • anonymous
so no one knows what to do?
welshfella
  • welshfella
the way you have written the equations is a little confusing- for example the first one|dw:1433686178817:dw| which of the following is correct:-
welshfella
  • welshfella
oh - hold on - it must be the first because the graph is a line sorry
welshfella
  • welshfella
i can see which one it is you just need to plug in the points and see which equation fits
imqwerty
  • imqwerty
(y-y1)/(y2-y1) = (x-x1)/(x2-x1) (y-7)/(9-7)=(x-3)/(6-3) (y-7)/2=(x-3)/3 3y-21=2x-6 3y=2x+15 y=(2/3)x+5
welshfella
  • welshfella
- the other way to do it is as imqwery has just done. he has derived the equation using the given points and used the general formula for a line given the coordinates of 2 points
phi
  • phi
which problem are you working on ?

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