This equation shows how Rosa's bank account balance is related to the number of raffle tickets she purchases. d = -3.4r + 63.6 The variable r represents the number of raffle tickets she purchases, and the variable d represents the balance of her bank account. How many tickets does Rosa need to buy to get the account balance down to $22.80?

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29-01-2017
Mathematics

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This equation shows how Rosa's bank account balance is related to the number of raffle tickets she purchases. d = -3.4r + 63.6 The variable r represents the number of raffle tickets she purchases, and the variable d represents the balance of her bank account. How many tickets does Rosa need to buy to get the account balance down to $22.80?

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AihberKhan AihberKhan · Answer 1 · 2017-01-29T11:11:22-05:00

So we know that $r$ is the number of raffle tickets she purchases and $d$ is the balance of her bank account.

We are given the equation $d = -3.4r + 63.6$ and we want to get the $account ~balance$ down to $22.80. So since @@MATH_TOKEN_4@@ represents the account balance just plug in $22.80 for d and solve for r.

When you do that you should get $r = 12$.

So, Rosa will need to buy 12 tickets to get her account balance down to $22.80.