In kick boxing, it is found that the force needed to break a board, varies inversely with the length of the board. If it takes 5 lbs of pressure to break a board 2 feet long, how many pounds of pressure will it take to break a board that is 8 feet long?

answer:

−1

step-by-step explanation:

6 and 9 are both divisible by 3, so we can simplify 6/9 = 2/3

we can multiply across right now, but we might as well cross cancel.

look at the numbers diagonal from one and 3 are both divisible by 3, so we can change them to -1 and and 2 are both divisible by 2, so we can change them to 1 and

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