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 basic mathematics image

Variables in algebra


Variables in algebra are letters such as x, y, v, g, or call it any letter you want that can be used to represent unknown numbers.



If the value of the variable is known, you can replace the letter with the known value.

All numbers can be graphed on a number line.

Just locate the value on the number line and put a dot.

For example, graphing x = 4 gives the following graph:

numberline-image

Other examples:

Graph x = -6 on the number line

Just locate -6 on the number line and make a draw a circle at -6

numberline-image

Graph x = 0

Just locate 0 on the number line and draw a circle

numberline-image

Now, write a statement of equality for each of the following graphs. Use x as the variable.

Graph #1:

numberline-image

Answer:    x = -2

Graph # 2:

numberline-image

Answer:    x = 8





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