A fact family is basically just different equations with the same numbers getting the same/different numbers as answers you might say...
this will make more sense:
5x8=40
8x5=40
40/8=5
40/5=8
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I belive it would be B. because of the fact that they are parallel which means their slope should stay the same...but their y-intersept would change
The answer to the question is b.4in
Tada, Its on the Image. Hoped I helped :)