What is the slope of the line x=-6! ?
what about y=6
explain : )

This is super simple. :)
If it is asking for a x=a it will always be 0 because there is no y intercept. It is a horizontal line.
For y=6 is undefined because it is a straight verticle line. An easy way to remember is if it is y or x = something with just 1 number and no coefficents on that number it will be x=0 or y=undefined. Also try to picture how it would graph and it might help. :)

The correct answer for this question is that a statement that can be proven by observation or measurement is known as a fact. The other possible answers here simply refer to idea that different individuals can place value on, but that are not necessarily known to be true.