Yes, its a function b/c y is a function of x.
Answer:
If the gift card is $30 the remaining change is 3 dollars
<span>add 2/9x to both sides, if you do that you get 2/9x+y=3. If you want to simplify it multiply everything by the denominator, in this case, 9 so then you would have 2x+9y=27
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