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3 years ago

Solve the system by substitution. -8x - y = 30 -2y = x

Mathematics

1 answer:

masya89 [10]3 years ago

4 0

Answer:

Solution: (-4, 2), x= -4 and y =2

Step-by-step explanation:

-8x - y = 30

-2y = x

Substitute for x

-8*(-2y) - y = 30

16y - y = 30

15y = 30

y = 30/15 = 2

Then x = -2y = -2*(2) = -4

Solution: (-4, 2), x= -4 and y =2

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3 years ago

A doctor prescribes a 300-mg antibiotic tablet to be taken every eight hours. Just before each tablet is taken, 20% of the drug

professor190 [17]

Answer:

So after the second tablet there is 360-mg of drug in the body.

So after the third tablet there is 372-mg of drug in the body.

Step-by-step explanation:

We know that a doctor prescribes a 300-mg antibiotic tablet to be taken every eight hours. Just before each tablet is taken, 20% of the drug remains in the body.

We know that 20%=0.2.

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We have the following formula, to calculate how much mg of the drug is in the body after the second tablet:

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We have the following formula, to calculate how much mg of the drug is in the body after the third tablet:

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So after the third tablet there is 372-mg of drug in the body.

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4 years ago

13x + 7 = 8x + 27 the answer

jeka94

The amswer is.......................216

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3 years ago

On a grid, what is the distance between two points located at (2,1) and (14,6)

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3 years ago

Read 2 more answers