The ratio of the difference of function values f(b) - f(a) to the corresponding difference of domain values b - a on an interval [a, b] is the
of the function over the interval. Also, known as the slope.
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Select a graph that have an equation with a < 0

Icould really use some with this question.

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?