To determine whether a graph of a relation is also a function Shayla to Claire’s at the Y axis is a vertical line in counts a number of times that the graph intersects the Y axis. If the graph has exactly one Y intercept, Sheila conclude that the graph shows a function. And all other case is she to close that it is not a function. Is Sheila applying the vertical line test correctly?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.