You are Here: Home >< Maths

# Inequalities and graphs watch

1. I wasn't really paying concentration in class today because i was so tired so I could use some help on how to work the equations out, plot the graphs and shade the regions. I got it in class but I've forgotten now

How do you work out y is lesser or equal to 3x.
And 3x+4y is greater than or equal to 12.

I don't want you to do the questions but just tell me how to work them out.

Thankyou.
2. First you would plot the lines normally on a graph as you would do if it was an equals instead of a sign. Then pick a value for y and if it fits the constraints, shade that side of the line. If it doesn't then shade the other side of the line.

This is a basic way of doing it but it work for me.
3. Thanks so for y=3x I would for whatever x is i triple the y right like normal?
4. Sorry it took so long to reply. To do y is lesser or equal to 3x draw the graph of y=3x and pic any number on the graph. If you triple the x coordinate and it is more than the y coordinate then hade this side of the line. If not shade the other side.

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: November 15, 2008
Today on TSR

### He lied about his age

Thought he was 19... really he's 14

### University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University
Wed, 1 Aug '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams