6 3.02 Debt Finance Charges
Junior
Mateo
5316 SU21 Adv Alg with Financ Appl (OCRSU) / 3.00 Debt
Al changes saved
2. Sonya uses her credit card to pay for new exhaust system that ended up totaling $831.75. She can pay off up to $300 a
month. The card has an annual rate of 20.5%. How much will she pay in interest? (3 points)
$27.90
$33.63
O $259.65
O $170.51

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So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.