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adell [148]
3 years ago
7

Solving systems by elimination with multiplication: 8x+7y=20 and 4x-4y=-20

Mathematics
1 answer:
borishaifa [10]3 years ago
3 0
If you put 0 in the place of x or y, which every one you choose, it will cancel it or and you can just divide the number next to it by the answer (-20, 20). Take it one step at a time, don't try to do both at the same time.
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Answer:

Step 1) Convert the 3.15 percent to a decimal number.

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Step 2) Convert the decimal number to a fraction.

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Step 3) Remove the decimal point in the numerator.

To remove the decimal point in the numerator, multiply both the numerator and denominator by 10000.

   

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Step 4) Simplify the fraction.

The greatest common factor of 315 and 10000 is 5. Therefore, to simplify the fraction, divide the numerator and denominator by 5.

   

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Step 5) Convert the fraction to a ratio.

To convert the fraction to a ratio, replace the fraction divider line with a colon.

   

63

   

2000

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That was the final step. Below is the answer to 3.15 percent as a ratio.

3.15% = 63:2000

Step-by-step explanation:

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