Answer:
Step-by-step explanation:
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<em>Answer:</em>
A: represents a function
<em>Explanation:</em>
Every other option, A, has two y for one x.
It can be a function if there is 1x for 1y.
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X - the number of pencils
y - the number of pens
She has twice as many pencils as she has pens.

Tom borrows a pen, so she has y-1 pens. Now she has ten less pens than pencils.

Set 2y and y+9 equal to each other:
She has 9 pens.
Deal 2 is the best deal. Deal 1 is $3.21 per apple but Deal two is $3.19 per apple.
7.91 = 8 21.9 = 22
8 + 22 = 30