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3 years ago

There is 7 more math problem

Mathematics

2 answers:

nevsk [136]3 years ago

7 0

Answer:

Step-by-step explanation:

2x+4y=10

-4x+y=-22

--------------

2(2x+4y)=2(10)

-4x+y=-22

--------------------

4x+8y=20

-4x+y=-22

----------------

9y=-2

y=-2/9

2x+4(-2/9)=10

2x-8/9=10

2x=10+8/9

2x=98/9

x=(98/9)/2

x=(98/9)(1/2)

x=98/18

x=49/9

Answer: x=49/9, y=-2/9. (49/9, -2/9).

Eddi Din [679]3 years ago

7 0

Answer: 2x+4y=10

-4x+y=-22

--------------

2(2x+4y)=2(10)

-4x+y=-22

--------------------

4x+8y=20

-4x+y=-22

----------------

9y=-2

y=-2/9

2x+4(-2/9)=10

2x-8/9=10

2x=10+8/9

2x=98/9

x=(98/9)/2

x=(98/9)(1/2)

x=98/18

x=49/9

Answer: x=49/9, y=-2/9. (49/9, -2/9).

Step-by-step explanation:

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3 years ago

How much of an alloy that is 10% copper should be mixed with 600 ounces of an alloy that is 60% copper in order to get an alloy

adell [148]

Answer:

1800 oz.

Step-by-step explanation:

There are already 600 ounces of alloy of nickel.

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Now available is

Copper Other metals

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Let x oz of 10% copper is added.

Then new alloy will have 300+0.1x oz copper in total of 600+x oz.

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Simplify to get

$\frac{300+0.1x}{600+x} =\frac{20}{100} \\\\Cross multiply:\\20(600+x) =100(300+0.1x)\\12000+20x =30000+10x\\10x = 18000\\x = 1800$

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3 0

3 years ago

(2x + 1, XS-5 f(x)= x?, -5 3-x, x5 f(-10) = f(2) = f(-5) = f(-1) = f(8) =

spin [16.1K]

Answer:

Step-by-step explanation:

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3 years ago

If sales tax in your city is 4.4 and an item cost 3$ before tax how much tax would you pay on that item?

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3 years ago