Jenna gets an iTunes gift card for her birthday and decides to buy some games and some music the music she likes costs $1.99 per
1 answer:
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Answer:
y = x
Step-by-step explanation:
Given that the quantities vary directly then the equation relating them is
y = kx ← k is the constant of variation
To find k use either of the 2 given points
Using (12, 9), that is x = 12 when y = 9, then
k = =
=
y = x ← equation of variation