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Mathematics 8 Online
OpenStudy (anonymous):

HELP MEEEE

OpenStudy (anonymous):

i have 4 questions lol

OpenStudy (kanard):

What are they?

OpenStudy (anonymous):

gimme a sec

OpenStudy (anonymous):

OpenStudy (anonymous):

@kanard

OpenStudy (anonymous):

@KamiBug

OpenStudy (anonymous):

@Michele_Laino

OpenStudy (anonymous):

OpenStudy (anonymous):

OpenStudy (anonymous):

OpenStudy (michele_laino):

hint: the slope of the line: \(y=mx+n\) is the coefficient \(m\)

OpenStudy (anonymous):

here are my guesses: c a a a idk??? im not sureee...

OpenStudy (anonymous):

ok so @Michele_Laino whick question are u reffering to?

OpenStudy (michele_laino):

to the second questio. Your answer is right, since it is option A, namely slope=-2

OpenStudy (michele_laino):

question*

OpenStudy (anonymous):

ohh thanks what about the others lol

OpenStudy (anonymous):

what do you think?

OpenStudy (michele_laino):

oops. I meant third question

OpenStudy (anonymous):

lol its allright i knew what u meant :P

OpenStudy (anonymous):

ok so what about lets say the fourth one?

OpenStudy (michele_laino):

fourth question: the line passes at points \((0,15)\) and \((10,0)\)

OpenStudy (michele_laino):

so the slope is: \[m = \frac{{{y_2} - {y_1}}}{{{x_2} - {x_1}}} = \frac{{0 - 15}}{{10 - 0}} = ...?\]

OpenStudy (anonymous):

its -15 over 10?

OpenStudy (michele_laino):

yes! We can simplify it like below: \(m=-3/2\)

OpenStudy (anonymous):

so it would either be c or d

OpenStudy (michele_laino):

so the requested equation, is: \[\begin{gathered} y - {y_1} = m\left( {x - {x_1}} \right) \hfill \\ \hfill \\ y - 15 = \frac{{ - 2}}{3}\left( {x - 0} \right) \hfill \\ \end{gathered} \]

OpenStudy (anonymous):

b?

OpenStudy (michele_laino):

oops... \[y - 15 = \frac{{ - 3}}{2}\left( {x - 0} \right)\]

OpenStudy (anonymous):

ohh lol c

OpenStudy (michele_laino):

are you sure?

OpenStudy (anonymous):

gimme a sec

OpenStudy (anonymous):

ugh my final answer is d what do you think?

OpenStudy (michele_laino):

that's right!

OpenStudy (anonymous):

yayeeee lol thx what about lets say the first question?

OpenStudy (michele_laino):

I'm thinking...

OpenStudy (anonymous):

lol

OpenStudy (anonymous):

i really don't understand that one

OpenStudy (michele_laino):

I think it is the line which passes among the most number of given points

OpenStudy (anonymous):

hmm so what does that mean?

OpenStudy (michele_laino):

that means we have to consider the option whose first point has the minimum possible x-coordinate, and the second point has the maximum possible x-coordinate

OpenStudy (anonymous):

ohh ok

OpenStudy (anonymous):

how do we do that?

OpenStudy (michele_laino):

first option contains a point whose x-coordinate is 0, which is the minimum possible and the second point has the x-coordinate equal to 10, which is the maximum value possible

OpenStudy (anonymous):

ok so what else do we have to do?

OpenStudy (michele_laino):

I think that only the first option can be considered as the right option

OpenStudy (anonymous):

i dont think that its either the c or d now

OpenStudy (anonymous):

oh wow lol great so.... moving on! LOL

OpenStudy (michele_laino):

ok!

OpenStudy (anonymous):

so how do we find a y - intercept

OpenStudy (michele_laino):

the y-intercept, is the value of y when x=0, so it represents the weekly hours of watching television, when the number of the weekly hours spent with family is zero

OpenStudy (anonymous):

whoa lol

OpenStudy (michele_laino):

|dw:1456350567629:dw|

OpenStudy (anonymous):

so either b or d ?

OpenStudy (michele_laino):

it is only one

OpenStudy (anonymous):

haha obvoiusly

OpenStudy (anonymous):

b!!! cuz thats where the line starts!

OpenStudy (michele_laino):

that's right!

OpenStudy (anonymous):

yayee thanks so so much!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(you saved my life!)

OpenStudy (michele_laino):

:D :D

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