please help i will reward 2 medals

- anonymous

please help i will reward 2 medals

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- katieb

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- anonymous

What do you need help with?

- 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

@Abhisar

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## More answers

- anonymous

Did you try substituting the points in the equations?

- anonymous

no

- anonymous

but i dont get how to do that

- anonymous

Alright, I'll explain.

- anonymous

thanks btw

- anonymous

so @ShizukaTheOtaku

- TheRaggedyDoctor

You can't give out two medals, btw..

- anonymous

yes i can

- TheRaggedyDoctor

No you can't.

- TheRaggedyDoctor

You can only give out one.

- anonymous

i can start a new convo with nothing

- 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

Those two points aren't on the same line.

- anonymous

ok so its b? if i am understanding @ShizukaTheOtaku

- anonymous

Right @ShizukaTheOtaku ??

- anonymous

How did you get that answer?

- anonymous

i did what you said and i got b

- anonymous

i am guessing it is wrong

- anonymous

By over do you mean 3 / (2x + 5) ?

- anonymous

yea

- 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

np u tried

- anonymous

@mathmath333

- anonymous

@mathmate

- anonymous

@imqwerty

- anonymous

@samanthagreer

- 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

over means /

- anonymous

so no one knows what to do?

- anonymous

so no one knows what to do?

- 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

oh - hold on - it must be the first because the graph is a line sorry

- welshfella

i can see which one it is
you just need to plug in the points and see which equation fits

- 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

- 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

which problem are you working on ?

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