Question

Do the following represent functions? Explain your reasoning y = -7x + 8

Answer 1

The expression is:

`y=-7x+8`

To be a function this has to have a unique values of y for each values of x, son in this case the expression has the form of a linear function that is equal to:

`y=mx+b`

So So for example if i replace x = 1:

`\begin{gathered} y=-7(1)+8 \\ y=1 \end{gathered}`

There is not other number that I can give to x that the output of y will be equal to 1, this means that the expression y = -7x + 8 is a function