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laiz [17]
3 years ago
7

If you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?.

. 2x+8y=12. 3x-8y=11. . A. y, in the first equation. B. x, in the second equation. C.x, in the first equation. D. y, in the second equation
Mathematics
2 answers:
Ludmilka [50]3 years ago
5 0

Answer:

the answer is c

Step-by-step explanation:

jeka57 [31]3 years ago
4 0
The answer is C. x, in the first equation. The first equation is easiest to simplify since other than 8y is their common variable, equation 1 is also divisible by 2 so it will not contain any fractions which would be harder to simplify.

Rearranging the first equation, the result would be:

2x + 8y = 12
8y = 12-2x----equation 1

This equation can then be directly substituted to the second equation since the value of 8y is given.

Substitute the right hand of the first equation of 8y which is 12-2x to the second equation. The result would be:

3x-(12-2x) = 11
3x-12 + 2x =11
5x = 11+12
5x = 23
x= 23/5
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Is the quotient of 3/5 ÷ 6/7 greater than or less than 3/5? Explain
Vikki [24]

The quotient of two fraction is the multiplication between the first and the inverse of the second:

\dfrac{a}{b} \div \dfrac{c}{d} = \dfrac{a}{b} \cdot \dfrac{d}{c}

So, in your case, you have

\dfrac{3}{5} \div \dfrac{6}{7} = \dfrac{3}{5} \cdot \dfrac{7}{6} = \dfrac{7}{10}

So, the question now is: which is larger, 7/10 or 3/5? To answer this question, transform the second fraction so that it will have denominator 10 as well:

\dfrac{3}{5} = \dfrac{3\cdot 2}{5 \cdot 2} = \dfrac{6}{10}

So, now it is clear that

\dfrac{7}{10} > \dfrac{6}{10}

3 0
3 years ago
Read 2 more answers
Anne owns a used car lot and in order to get cars to sell, she buys used cars at an
azamat

Answer:

It would be 2,000x+200

Step-by-step explanation:

okay it costs $200 to attend so that's a cost you are going to have to pay regardless. The $2,000 depends on how many cars you buy. So it would be 2,000 (times how ever many cars you buy) plus the $200.

3 0
3 years ago
Write an expression for the phrase.
vitfil [10]

Answer:

9+k-17

Step-by-step explanation:

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5 0
3 years ago
Question 1
777dan777 [17]

Answer:

There would be 94 tiles.

Step-by-step explanation:

The number of tiles is given by the following equation:

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In which p is the current position.

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This is n when p = 22. So

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There would be 94 tiles.

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lukranit [14]
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