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Mathematics 18 Online
OpenStudy (anonymous):

Select the inequality that corresponds to the given graph. 2x - 5y -10 x - y > 3 2x - y < -4 x + 2y -8

OpenStudy (anonymous):

OpenStudy (anonymous):

@ParthKohli @Miyuru @henpen @Preetha

OpenStudy (anonymous):

@sasogeek

OpenStudy (anonymous):

|dw:1350921035335:dw|

OpenStudy (anonymous):

it is either the first or the last one i know that

OpenStudy (anonymous):

because of the solid line

OpenStudy (anonymous):

@ParthKohli

OpenStudy (anonymous):

@TheViper @Preetha

Parth (parthkohli):

Well, don't look at it like an inequality. First, find the equation of the line.

OpenStudy (anonymous):

Can you walk me through it?

Parth (parthkohli):

Sure, take any two points ON the line.

OpenStudy (anonymous):

do i pick the points are will you

Parth (parthkohli):

I'm trying to walk you through it... I don't know the answer either. :p

Parth (parthkohli):

You pick two points for me.

OpenStudy (anonymous):

i pick (-5,0) and (0,2)

OpenStudy (anonymous):

Okay?

Parth (parthkohli):

Very good. Now what is the equation of that line?

Parth (parthkohli):

Try to look at it as an equation, and we'd do some manipulation and convert it into an inequality. :)

OpenStudy (anonymous):

I dont know

OpenStudy (anonymous):

whatt the equation is

Parth (parthkohli):

\[\rm \large y -y_1 = m(x -x_1)\]Now?

Parth (parthkohli):

Start with figuring out the slope.

OpenStudy (anonymous):

2-0=0

Parth (parthkohli):

Hmm... no!

OpenStudy (anonymous):

I mean 2

OpenStudy (anonymous):

sorry

OpenStudy (anonymous):

Then 0--5=5

Parth (parthkohli):

\[\rm \large slope = {y_2 - y_1 \over x_2 - x_1}\]

OpenStudy (anonymous):

2/5

OpenStudy (anonymous):

is the slope

Parth (parthkohli):

right! 2/5

OpenStudy (anonymous):

yes

Parth (parthkohli):

Okay, now pick any point.

Parth (parthkohli):

Any of them.

OpenStudy (anonymous):

y-0=2/5(x--5)

OpenStudy (anonymous):

right?

Parth (parthkohli):

That's right!

Parth (parthkohli):

\[\large \rm y ={2 \over 5}\left( x + 5\right)\]Right?

OpenStudy (anonymous):

okay then it becomes y-0=2/5x +2

OpenStudy (anonymous):

right?

Parth (parthkohli):

Yeah, and y - 0 = 0.

OpenStudy (anonymous):

0=2/5x=2

OpenStudy (anonymous):

right?

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