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3 years ago

Help plz I don't understand

Mathematics

1 answer:

IrinaVladis [17]3 years ago

7 0

Answer:

(-9,-3.4)

Step-by-step explanation:

By adding 2.1x and subtracting 5.3 from the top equation, it will end up as 2.1x=4y-5.3

By adding 5.5y to the bottom equation, it will end up as 2.1x=5.5y-0.2.

By the equal valuesmethod, they are equal: 5.5y-0.2=4y-5.3

5.5y+5.1=4y

5.1=-1.5y

y=-3.4; this gets us our y-coordinate.

To get the x-coordinate, you plug the value for y back into the original equation.

-2.1x-4y=5.3

-2.1x-4(-3.4)=5.3

-2.1x-13.6=5.3

-2.1x=18.9

x=-9

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4 years ago

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umka2103 [35]

Answer:

It will take 6 hours for the new pump to drain the pool.

Step-by-step explanation:

As the complete question is not given, the complete question is found online and is attached herewith

Let the rate of new pump is given as x=W/t_1

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Also the total rate of both the pumps is given as W/t3 where t3 is given as 4 hours so the equation becomes

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Now as W is same on both sides so

3/2t_1=1/4

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4 years ago

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Step-by-step explanation:

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3 years ago

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4 years ago

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Step-by-step explanation:

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