How do you write a variable expression for the word phrase "9 less than k"?

1 Answer
KillerBunny
Jun 19, 2018

#k-9#

Explanation:

The operand we use to express something "taken away" from something is the difference.

So, if we start from some number #k#, #k-1# means that we took #1# away from #k#, so #k-1# is #1# less than #k#.

Going on, #k-2# is #2# less than #k#, and #k-3# is #3# less than #3#, because we took away #3# from #k#, and so on...

So, #k-9# is #9# less than #k#, since we took #9# away from #k#

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