Solve each system by ELIMINATION 1) -5x-Y=21 - 4x Y=6

Mathematics

1 answer:

sesenic [268]3 years ago

5 0

-5x-Y + -4x + Y = -9x
21 +6= 27
-9x = 27
x= -3

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Between 10 P.M. and 7:54 A.M., the water level in a swimming pool decreased by 11/40 . Assuming that the water level decreased

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Answer:

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Step-by-step explanation:

First, we calculate the decrease.

Decrease = 11/40 = 0.275

Then, we calculate the time interval.

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Time interval= (9 + 54/60) hours

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Finally, we calculate how much it dropped each hour

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