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
Join the QuestionCove community and study together with friends!
Sign Up
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
Join the QuestionCove community and study together with friends!
Sign Up
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?
Join the QuestionCove community and study together with friends!
Sign Up
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)
Join the QuestionCove community and study together with friends!
Sign Up
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
Join the QuestionCove community and study together with friends!
Sign Up
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
Join the QuestionCove community and study together with friends!
Sign Up
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
Join the QuestionCove community and study together with friends!
Sign Up
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)
Join the QuestionCove community and study together with friends!
Sign Up
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?
Join the QuestionCove community and study together with friends!
Sign Up
Parth (parthkohli):
Yeah, and y - 0 = 0.
OpenStudy (anonymous):
0=2/5x=2
OpenStudy (anonymous):
right?