What is a rate in which the second quantity is one unit?

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

The only way to identify an intercept is as an ordered pair. true false

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)