Graphing linear equations
When it comes to graphing linear equations, there are a few simple ways to do it. The simplest way is to find the intercept values for both the xaxis and the yaxis. Then just draw a line that passes through both of these points. That line is the solution of the equation and its visual representation. The most appropriate form for this is the slopeintercept form, since it is the easiest one to get the information about intercept values from. Problems that can occur with this approach to graphing linear equations happen when you have almost vertical or almost horizontal lines. In these cases the intercept values will be very high and very difficult to draw. The second approach is just a bit different. Instead of intercepts, choose low values for one of the coordinates (for example: x = 1, 2, 3…) and calculate the other coordinate using these values.
We will use an example to give you a little demonstration. Let us say you have to draw the graph of this equation:
y = 6x + 2
We will first calculate the yintercept by setting the value of x at 0 and then calculate the xintercept by setting the value of y at 0.
y = 6*0 + 2
y = 2
0 = 6x + 2
6x = 2 :6
x = 1/3
So, the intercept value for the yaxis is 2 and for the xaxis is ( 1/3). The only thing left to do is to draw a line that passes through these two points and you found the solution.
Now, let us try the other approach to graphing linear equations. We will use the same equation as before, but this time we will try to calculate the value of one coordinate using predetermined values of the other coordinate. Since y is so much larger than x, we will insert different values of x into the equation (in order to avoid dealing with fractions). We will choose x = 1 and x = (0) in this situation.
y = 6x + 2
If (x = 1),
y = 6*1 + 2
y = 8
If (x = 0),
y = 6*0 + 2
y = 2
So now we have two points – P1 (1, 8) and P2 (0,2). All that is left to do is to draw the line passing through these two points.
The same procedure is used when graphing inequalities. The only difference is that the solution of the equation is not necessarily the line itself, but the area over or under the line. That depends on the sign of inequality. In this table, we will give you a short overview of the possible solutions. The three dots represent all of the elements on the other side of the expression.
Inequality  Solution 
y > …  The area above the line 
y < …  The area under the line 
y ≥ …  The area above the line and the line itself 
y ≤ …  The area under the line and the line itself 
x > …  The area to the right of the line 
x < …  The area to the left of the line 
x ≥ …  The area to the right of the line and the line itself 
x ≤ …  The area to the left of the line and the line itself 
These are the basic rules to graphing linear equations and linear inequalities. If you wish to practice graphing linear equations, please feel free to use the math worksheets below.
Graphing linear equations and inequalities exams for teachers
Exam Name  File Size  Downloads  Upload date 
Equations


Graphing linear equations – very easy  545.9 kB  6964  October 13, 2012 
Graphing linear equations – easy  541.3 kB  7809  October 13, 2012 
Graphing linear equations – medium  518.5 kB  10603  October 13, 2012 
Graphing linear equations – hard  558.9 kB  5103  October 13, 2012 
Graphing linear equations – very_hard  708.7 kB  3480  October 13, 2012 
Inequalities


Graphing linear inequalities – very easy  557.2 kB  1944  October 13, 2012 
Graphing linear inequalities – easy  542.1 kB  1649  October 13, 2012 
Graphing linear inequalities – medium  719.7 kB  2048  October 13, 2012 
Graphing linear inequalities – hard  716.1 kB  1438  October 13, 2012 
Graphing linear equations and inequalities worksheets for students
Worksheet Name  File Size  Downloads  Upload date 
Graphing linear inequalities  9 MB  2367  October 14, 2012 
Graphing linear equations  17.1 MB  4231  October 14, 2012 