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how do I solve -2x=9 and graph?

I am having trouble understanding how to solve and graph -2x=9.

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2 Answers

And the graph would be a vertical line through x=-4.5.

To solve this problem you need to have ONLY x on one side of the equation, but remember that what ever is done to one side of the equals sign must also be done to the other. So, to get x by itself, divide BOTH sides by -2.  Then to graph x = c, where c is the value found from above, it is just a straight verticle line at x = c on the graph.



(-2x)/(-2) = 9/(-2)

x = -9/2 = -4.5