Question

Can someone please briefly (it could be long whatever you have time for) explanation of Interpreting and solving linear inequalities OR Interpreting linear expressions? They confuse me.

Answer 1

Hello, I can help you with this.

Answer 2

plz help

Answer 3

Can you post a specific question that we can use as an example?

Answer 4

Interpreting and solving linear inequalities: Write an inequality for this statement:
3 times a number x, subtracted from 18, is less than −90

Answer 5

part of answering this question has nothing to do with inequalities. you need to be able to do algebra.

Answer 6

If you need more "background", you should look at the videos in this section
http://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-beginner-equations/v/simple-equations

Answer 7

I can do algebra it just confuses me
ik its: 3x-18 is less than -90.
So do you like divide or multiply by something?

Answer 8

Ok ya, Khan is what gave me the question I watched the video twice already. I'll watch it again later and tell you if it helped.

Wait...my math teacher is making me do SIXTH GRADE MATH! I do not like that. I can do like most 7th grade math I don't understand y 6th grade math confuses me

Answer 9

That looks pretty close. 3 times a number x is 3*x, but we just write 3x (which means 3 times x)

but the next step in
3 times a number x, subtracted from 18

I think of that as
3x subtracted from 18

now to interpret what that means, sometimes it is helpful to think using simple numbers (and not letters... until you get good at it)

if it said
1 subtracted from 18
do you know what that means ?

Answer 10

or how about if the problem was
1 penny subtracted from 18 pennies?
or (using take away instead of "subtract"

1 penny taken away from 18 pennies?

they all mean 18 -1

or, going back to
3x subtracted from 18

that is 18-3x
(3x is taken away from 18)

Answer 11

ok

Answer 12

so 18-3x

Answer 13

ok so after we switch the places we...

Answer 14

so back to the problem.
Write an inequality for this statement:
3 times a number x, subtracted from 18, is less than −90

we got to
18 - 3x is less than -90

we write less than using <
the skinny pointy end points at the small side, and the wide part points to the big side

18 - 3x < -90

Answer 15

that is an inequality for the statement. It can be simplified, but they did not ask you to do that.

Answer 16

oh

Answer 17

That was easy. I feel stupid now.

Answer 18

Thank you so much. This helped alot