Find the slope

2/3
-2/3
3/2
-3/2

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.

How can you find the mean absolute deviation (mad) for this set of data?