Question 390641
<pre>
No it does not express the first variable as a function of the second variable

{(<font color = "blue">2</font>, -4)(<font color = "red">-2</font>, 0)(<font color = "blue">2</font>, 2)(<font color = "red">-2</font>, 4)(3, -2)(-3, -2)}

Note the two blue {(<font color = "blue">2</font>'s are both first coordinates.  A function cannot
use the same first coordinate twice.

Note the two red {(<font color = "red">-2</font>'s are both first coordinates.  A function cannot
use the same first coordinate twice.

So there are two pairs of ordered pairs that keep this from being a 
function.

Edwin</pre>