Question

Select an ordered pair from the choices below
-5x>4-7y
3y-4x>18
1. (4,-5)
2. (3,4)
3.(-1,5)
4.(1,-1)

Answer 1

I think you can just plug in the points and see if they work. Otherwise, you can solve the inequalities for practice!

Answer 2

I know how to plug them in and do the work but I don't understand how to tell if the answer is right.

Answer 3

Alright! So, if you're plugging the multiple choice answers in and doing the work, you'll get\[something\gt something\]and\[something\gt something\]
Both of those must be "true." Like, if you read it as a sentence, you shouldn't be lying.

For example, \(5\gt 100\), lie. So if your multiple choice answer gives you something like that, it's wrong.

Answer 4

You could, maybe, use the two inequalities to make one... Maybe...

Answer 5

Alright i'm going to try this out again. Thank you :)

Answer 6

Yeah, I'll be here until you're done, just in case you have more questions!

Answer 7

I have eliminated the first two im trying th next two. Sorry im taking long

Answer 8

Not a problem! I'm on here anyway! The time it's taking.. Maybe there's a faster way!
There is graphing \(\rightarrow\) http://www.purplemath.com/modules/syslneq.htm

Answer 9

Is the last one correct??

Answer 10

Let's see.
\[-5x>4-7y\\\qquad\downarrow\\-5(1)\gt4-7(-1)\\\qquad\downarrow\\-5\gt4+7\\\qquad\downarrow\\-5\gt 11\]
I don't think so..

Answer 11

http://www.wolframalpha.com/input/?i=-5x%3E4-7y+AND+3y-4x%3E18 there is an inequality plot. Have you been taught about them?

Answer 12

No I don't understand that

Answer 13

I see... And you tried all of the choices?

Answer 14

Yeah my math is probably just wring somewhere im going over it agian

Answer 15

Try #3 again first...

Answer 16

The first part I got 5>-35
But the second part I got 11>18

Answer 17

or does it become 15+4=19
and is 19<18?

Answer 18

\[3y-4x>18\\\qquad\downarrow\\3(5)-4(-1)\gt 18\\\qquad\downarrow\\15-^-4\gt18\]
You hit the nail on the head!
Congrats!

Answer 19

:)

Answer 20

Haha love that expresseion :) lol
Thank you :)

Answer 21

19>18

Answer 22

Just for fun...
\(\huge\color{blue}{\large\ \ o\ o\ \\\smile}\)

Answer 23

\[15+^+4\gt 18\\\qquad\downarrow\\19\gt 18\]

Answer 24

Thanks!