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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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