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 Amsco Integrated Algebra I: Graphing a Line Parallel to an Axis
This is a free lesson from our course in Amsco's Integrated Algebra
 
   
This lesson shall help you learn to draw the graph of a line parallel to an axis. The equation of a line parallel to the x-axis and b units from the x-axis is y = b. If b is positive, the line is above the x-axis, and if b is negative, the line is below the x-axis. For example to graph of the line y = 2 we first have to find the other pair (a, 2) for all values of a, and then plot these pairs on the graph. Similarly the equation of a line parallel to the y-axis and a units from the y-axis is x = a. If a is positive, the line is to the right of the y-axis, and if a is negative, the line is to the left of the y-axis. (More text below video...)
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(Continued from above) For example, to graph of the line x = -3 we first have to find any other pair (-3, b) for all values of b, and then plot these pairs on the graph For example: consider the equation 2x+4 = 0.
2x = -4 and x= -4/2 = -2.

Since the equation is independent of y, for all values of y, x = -2. Hence x = -2 is a line parallel to the y-axis at x = -2
The video above explains in detail about Graphing a Line Parallel to an Axis, with the help of several examples.
The video above explains in detail and offers math home work help solving several examples of sets, relations, functions and how to represent them.
 
   

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