Given each transformation, choose the correct image for the point (a,-b)

1. after 180° counterclockwise rotation around the origin:
2. after reflection across the line y = -x:
3. after 90° counterclockwise rotation around the origin:
4. after reflection across the y-axis:

Which system of linear inequalities is represented by the graph?

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.

What is the point slope form of a line with slope -5 that contains point (2,-1)