ANSWER:
FIRST STEP:
k = 5(2.5) (5(2.5) means 5 x 2.5)
k =12.5
SECOND STEP
12.5 = yx
12.5 = y(20)
12.5/20 =y (ur going to divide them cuz u switched places multiplication becomes division and when u have + it becomes - and the other way round)
0.625 =y
so ur answer is B
~batmans wife dun dun dun...aka ~serenitybella