Answer:
The last one, (-6,9)
Step-by-step explanation: For it to be right the nine would have to be negative.
Isolate the B. Note the equal sign. What you do to one side, you do to the other. Subtract C and A from both sides
B + A (-A) + C (-C) = D (-A) (-C)
B = D - A - C
B = D - A - C is your answer
hope this helps
Your answer is 4/12 = 6/18