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KengaRu [80]
3 years ago
11

How to substitute equations for solutions 3x-2y=9 Y=2x-7

Mathematics
2 answers:
miss Akunina [59]3 years ago
7 0
First I would rewrite it so all the x's and y's are in the same places

3x-2y=9
-2x+y=-7

Then multiply the bottom one by 2
-4x+2y=-14

Then add the equations
   3x-2y=9
+-4x+2y=-14
-------------------
-x=-5 or x=5

The substitute this into one of the original equations to solve for y.

y=2(5)-7
y=3

So your answer is x=5 and y=3 or (5,3)

Hope this helps.

xxTIMURxx [149]3 years ago
5 0

3X-2(2X-7)=9

3X-4X+14=9

-X=-5

X=5

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Answer:

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Given: Yvonne bought a car for $10,300. After 3 years, the value of the car was $6,250. 50%

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Formula: (\frac{interest rate}{number of payments}) × loan principal = interest

Solution:  Divide your interest rate by the number of payments you’ll make in the year (interest rates are expressed annually). So, for example, if you’re making monthly payments, divide by 12. Multiply it by the balance of your loan, which for the first payment, will be your whole principal amount.

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The total amount accrued, principal plus interest, with compound interest on a principal of $10,300.00 at a rate of 50% per year compounded 12 times per year over 3 years is $44,778.84.

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