A teacher uses 36 centimeters of tape to hang up 9 student projects. At that rate, how much tape would the teacher need to hang
1 answer:
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If 
, then
. So, in the first gap you can write 5 and in the second you can write -4.
Since
, the minimum value of y is when 
. The solution of the last equation is x=-5 and then y=-4 -- these are numbers, which you can write in the third and fourth gaps.
Since