Math help needed: what is the justification for the sixth step?

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 6th, 2015

Thank you for the opportunity to help you with your question!

A) AD =
-9 - -3 = -6
2- -2 = 4

therefore -6/4 = -3/2

BC=
-10 - -1 =-9
7- 1 = 6

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 6th, 2015

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