Answer:
opposite sides have to be parallel and congruent
Step-by-step explanation:
(-1,1)
Let = -9, = -12 and so on.
-15 = -9 + (-6)
-15 = -9 + 2(-3)
Let -3 be the common difference, or <em>d</em>.
= -9 + n(-3)
= -9 - 3n
12/25 is the answer. hope that helped