Can u help please 8th grade math​

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

According to the number line, what is the distance between points a and b? v ++ + + + + -16 -14 -12 -10 -8 + 6 + 4 + -2 + 0 + 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 o6 units o 7 units 12 units o 14 units

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?