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graph y=2x by making a table

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2 Answers

So to graph using a table, the first step is...well... make a table. so you have a column of x and y. under the x column write down a bunch of values you would like to test. I am going to test -2 through 2.
x | y
-2|
-1|
0 |
1 |
2 |
 
Next, we have to plug each of those values into the equation y=2x to see what the corresponding y value is.
when x=-2 y=2(-2)=-4, when x=-1 y=2(-1)=-2, and so on...
x | y
-2|-4
-1|-2
0 |0
1 |2
2 |4
 
Next, graph those points on a coordinate plane. Each row on the table is a point on the graph, (x,y).  Hope that helps!
Hi Eli;
Let's make a table...
x | y
-2| -4
-1| -2
1 | 2
2 | 4
 
Let's make a graph...
 
                  4    X
                  3   
                  2 X
                  1 
__________0__________
     -4-3-2-1 0 1 2 3 4
                 -1
               X-2
                 -3
            X   -4