# Slope???

Question:Okay so i'm studying up fofr going back to school but i just dont at al remember how to do this problem:
Plot the cordinates using this equation----- y=2x-1
now i dont remember how you go about ploting that do you have to put a number in for y and x?
Any help would be appriciated!

you can plug any number into X and solve for Y and vise versa.. FOR EXAMPLE

x=0
y=2(0)-1
y=-1
(0,-1)

OR

y= 2
2=2(x)-1
3=2(x)
x=3/2
(3\2, 2)

Hope that helps
All the variables go to one of the equal sign and the numbers go on the other. Then just simplify if possible and lastly just solve it! Hope this helps at least a bit! Good luck!
yes, you make up (easy) numbers for x, plug them in and get y, then graph those 2 as a point.

y = 2x - 1
let x = 1
y = 2(1) - 1 = 1
the point is (x, y) which is (1, 1). plot that on a coordinate system.

now do that for another value for x, like 2 (hint, hint). plot that point as well.

those 2 points are really all you need for a line. connect the dots.
the equation for slope is y=mx+b
m is the steepness of the slope like 1/2
y is the horizontal axis like 2
x is the vertical axis like 5
b is the difference between teh x and y axis
You should recognise that y=2x-1 is a straight line ? ? ? If you

do, then you will realise that you only need to plot two points

and then join them up with a ruler. I`ll take values of x as 0 and

2.

When x=0,

y=2x-1, so

y=2*0-1,so

y=-1.

when x=2,

y=2x-1, so

y=2*2-1, so

y=4-1, so

y=3.

On 2cm graph paper, and using scales of 2 cm to 1 unit on

each axis, now plot the points {0,-1} and {2,3}. Join them up

using ruler and pencil, and extend the line in each direction.

There you have the graph of y=2x-1. You can only do it this

way if the equation of the graph can be written in the form

y=mx+/- b. If the equation includes x squared or a higher

power of x, or it includes something over x, then you have

to plot each individual value of x and y. Hope this helps,

Twiggy.

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