Vertical Lines


The following is the grid of a city's street numbers (north/south) and avenue numbers (east/west). Avenue 10 is highlighted. As you can see, avenue 10 runs parallel to the street numbers.



  Street and Avenue Table    City Streets Grid


As you can see, for any value of y, we have x equal to 10. Thus the equation of the line is x = 10. Also note that the line is parallel to the y-axis.


Rule       Vertical lines have a graph of x = a, where a is a constant.
Rule


Ex. Lets take a look at the following graphs. Place you mouse over the equation to see its graph.
Y = 2

Y = -2

Y = 4

Y = -4


Try writing two equations on your own. Look at the graphs corresponding to numbers 1 and 2. Enter the correct vertical equation in each box (i.e. x = -20). When you are finished, click the Mark Now button

1.  Write the equation of the line.





2.  Write the equation of the line.



            
            



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