SOLUTION: Hello, My name is Johnny. Can someone help me with graphs? I really, really don't understand how to do them. I need help. I brought some examples of the type of stuff where doin

Question 7176: Hello, My name is Johnny. Can someone help me with graphs?
I really, really don't understand how to do them. I need help. I brought some examples of the type of stuff where doing, but I don't know where to begin, my teacher goes so fast you can't really understand what he is saying.
1. y = 2x
2. y = -2x + 1
3. y = 3x - 2
4. y = xsquared - 4
Please, I really need your help.
Johnny
Answer by Earlsdon(6098) (Show Source):
You can put this solution on YOUR website!
You can start by preparing an input/output table for each equation.
The purpose of this input/output table is to give you the coordinates of a number of points which you can then place on you graph paper in the appropriate places. This will allow you to draw the line through these points to get the graph of the equation.
I'll do 1. and 4. then you will be able to see how to do the others.
1. y = 2x Remember that x is the independent variable. This means that you can assign any value you want to x and the resulting value of y (the dependent varable) depends on what value you have assigned to x.
Make a table of the values that you assign to x (input) and the resulting values of y (output).

x......y
0......0
1......2
-1....-2
Now let's see what the graph of this looks like.

4.
x.....y
0....-4
1....-3
2....0
-1...-3
-2...0
Let's see what the graph of this one looks like:

See if you can do the others.