Answer:Coming out like this the normal vectors are going to be parallel to one another. So it's easier for me to test to see whether the normal vectors are parallel.
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Try looking up answer sheets for this question I don't know the answer but i would help you if i could.
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what the question there is no picture
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I believe it is referred to as The Substitution Method.
81 is a counter example of the conditional statement given.
81 has factors other than itself, 1 and the square root of 81 which is 9.
81 has factors of 3 and 27 which are not listed.