5-A-3: My definition of Equations and Functions.

Equation- a number sentence that compares one expression to another.

3 + x = 12

3x=15

20 – x = 10

We can look at these equations in a way that we are trying to find out what we can replace “x” with to make it balanced on both sides.  We can view an equation as a “seesaw”.  In order to make the “seesaw” balanced an even we must replace the variable with a number so that both sides have the same amount of wait.

Function-  something that is done to one number (x) to create a new value (y).

x (input)     1           2          3             4
___________________________                   Function Y= X +3

y (output) 4            5          6            7

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