A function cannot have multiple outputs (y-values) for any given input (x-values). For example, y=2x+3 is a function because no mater what number x represents, there is a single, unique y-value (When x=3 y=9 ). In other words, you can never have two (or more) y-values that correspond to a single x-value. Therefore, a vertical line, for example x=2, cannot be a function because it has an infinite amount of y-values for a single x-value. A horizontal line is a function because there is only one y-value for any given x-value. For example, y=3. No mater what x-value is used, there is only one y-value possible (in this case, y will always equal 3). I am, of course, referring to the cartesian coordinate system, also known as the rectangular coordinate system

5 0

4 years ago

Kinu has 7 memory sticks that contain data from his computer. Some of the me

ra1l [238]

Solving the system of equations, it is found that x = 3, that is, there are 3 128 MB memory sticks.

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We want to solve for x, thus, in the first equation, we write y as a function of x, that is:

$y = 7 - x$