To write and equation we call y=oil and x=vinager, so:

To find the constant k we can use the point in the picture (vinager, oil) = (x, y) = (1, 1.5), so:

So, the equation is:

Now, the meaning of the point (1, 1.5) is for 1 amount of vinager you need 1.5 amount of oil.
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Answer:
297 cards in a year
Step-by-step explanation:
There are 12 months in a year, and he gets 2 packs of cards every month.
12*2 = 24 packs of cards a year
He gets 3 extra packs of cards for his birthday.
24 + 3 = 27 packs of cards
There are 11 cards in each pack.
27 X 11 = 297 cards in a year