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QveST [7]
3 years ago
6

Solve the system of equations. ​ 2y+7x=−5 5y−7x=12 ​

Mathematics
1 answer:
defon3 years ago
5 0

\text{Solve the systems of equations:}\\\\2y+7x=-5\\5y-7x=12\\\\\text{Solve by adding and subtracting}\\\\7y=7\\\\\text{Divide}\\\\y=1\\\\\text{To find x, plug 1 into y in one of the equations and solve:}\\\\2(1)+7x=-5\\\\2+7x=-5\\\\\text{Subtract 2 from both sides}\\\\7x=-7\\\\\text{Divide by 7}\\\\x=-1\\\\\boxed{y=1\,\,and\,\,x=-1}

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Milan invested his savings in two investment funds. the $4000 that he invested in fund a returned a 3% profit. the amount that h
mariarad [96]

Given:

                                Percent                Amount $

Fund A                 3%                          $4000

Fund B                  1%                          x

Total Funds        8%                          $4000 + x

 

Find:

Fund B Investment

 

Solution:

 

$4000 * .03 + .10 * x = .08% ($4000 + x)

We already know 3 rates and one amount invested

$4000 * .03 + .10 * x = .08% ($4000 + x)

Multiply them out:

120 + (0.10 * x) = 320 + 0.08x

Now, we combine like terms.

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.02x = 200

Isolate x

x = 200 / 0.02

Divide

x = $10,000

Checking:

($4000 * .03) + (.10 * 10,000) = .08% ($4000 + 10,000)

120 + 1000 = 320 + 800

1120 = 1120


Therefore, fund B has an investment of $10,000.

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