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Rufina [12.5K]
3 years ago
13

NEED HELP ASAP PLEASE WITH #9 and #10!!

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
8 0
9) Because the total number of pencils is 180 and you will use them up in 30 days, the equation will have to equal 0 total pencils when 30 is substituted in for the time factor, or x. This already takes our choice 3 because it doesn’t meet this criteria.
The answer to how many pencils in 20 days could be answered by plugging in 20 for x. Choice 4 cannot work because it results in a negative number of pencils. Choices 1 and 2 use the same equation, so by plugging in 20 it is clear choice 2 is the correct answer.

10) A line parallel to the go en equation would have the same slope, -3, which means choices 1 and 4 are out. Plug in (-2,5) into both choices 2 and 3. Plugging -2 into x in choice 2 gives -5, and in choice 3 gives 5 for the y value. Therefore choice 3 is correct.
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In order for two lines to be perpendicular, their slopes must be opposite reciprocals...
FK is perpendicular to FL
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JL is perpendicular to FL
JL is perpendicular to KJ
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