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Alexeev081 [22]
3 years ago
6

What should be done to these equations in order to solve a system of equations by elimination?

Mathematics
1 answer:
morpeh [17]3 years ago
7 0

Answer

You can multiply the first equation by 4 and the second equation by 3.

You can multiply the first equation by 4/3.

You can multiply the first equation by 3.

Explanation

When solving a system of equations by elimination, you want to add or subtract the equations to "get rid" of a variable.

To do that, one of the variables in both equations have to have the same coefficient.

The first answer possible gives x the coefficient of 12 for both equations. You would get 12x+4y=52 and 12x-9y=39. You could subtract those equations to get 13y=13.

The second way gives x the coefficient of 4. You would multiply the first equation by 4/3 to get 4x+4/3y=52/3. You can subtract to get one variable, and then solve from there. Although, multiplying for 4/3 is annoying, so it's not suggested.

You can also "get rid" the the y. Multiply the first equation by 3 to get 9x+3y=39. You can add these equations. When you add 9x+3y=39 and 4x-3y=13 you get 13x=52.

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At the sewing store, Eva bought a bag of mixed buttons. She got 64 large buttons and 16 small buttons. What percentage of the bu
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Answer:

80% of the buttons were large.

Step-by-step explanation:

Recall that percentages are fractions.

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64 + 16 = 80

Then we need to divide 64 into 80 as a fraction of the whole (80 is our whole)

64 ÷ 80 = 0.8

To convert our decimal to a percentage, we must multiply it by 100.

0.8 * 100% = 80%

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3 years ago
Sue had $100.00 in her wallet. She spent 23% of that money on notebooks and folders how much money did she spent?
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3 years ago
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Last year, nine employees of an electronics company retired. Their ages at retirement are listed below.
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Answer:

58.0

Step-by-step explanation:

Given the data:

56 65 62 53 68 58 65 52 56

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Hence, median age is 58

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3 years ago
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Answer:

Step-by-step explanation:

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3 years ago
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