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2 years ago

Solve the system of linear equations using elimination. -5x + 3y = -19 -x – 3y = -11

Mathematics

2 answers:

coldgirl [10]2 years ago

8 0

3z=5.-x3y-z=-3.2x=6 there you go

Ierofanga [76]2 years ago

8 0

What the first person said

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Evaluate u+ xy for u=9, x=9, y=7

Bad White [126]

U+xy
On replacing for u, x and y.
=9+9*7
=9+63
=72

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2 years ago

What are the solutions to the quadratic function. f(x) = x^2+4x-12

Rudiy27

Answer:

2, -6

Step-by-step explanation:

x^2 + 4x - 12

A = 1

B = 4

C = -12

i used the "X" method to solve for the solutions. i think it's easier than using the quadratic formula but it doesn't always work

for the "X" method you have to multiply your A value and your C value together so 1 x (-12) = -12. that is going to be the top part of the X

the bottom part of the x will be your B value which is 4

we have to find multiples of -12 that will also add to 4

so -2 and 6 multiply to -12 but also add to 4 so we know these numbers will work

i added added two drawings to show how i found the solutions using the "X" method and the quadratic formula

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2 years ago

Read 2 more answers

Consider the problem of distributing 10 distinct books among three different people with each person getting at least one book.

kakasveta [241]

The strategy used is not well, because it becomes very complex and very difficult to calculate the ways, it would play one by one, that is, despite making sense, the last part of the way to distribute the books how is it obtained? why would it be like this?

There is a much more effective way of solving the problem, and that is to divide it by cases.

Case 1:

Choose four books from the 10 available books and give them to the first student

Then choose three books from the remaining six books and give them to the second student.

Finally, give the remaining three books to the last student

Case 2:

Choose three books from the 10 available books and give them to the first student

Then choose four books from the remaining seven books and give them to the second student.

Finally, give the remaining three books to the last student

Case 3:

Choose three books from the 10 available books and give them to the first student

Then choose three books from the remaining seven books and give them to the second student.

Lastly, give the remaining four books to the last student

First it is to calculate the number number in each case by means of combinations, multiply the options per case and then add the final value in each case.

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3 years ago

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IceJOKER [234]

Answer:

ddd

Step-by-step explanation:

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2 years ago

You deposit $5000 in an account earning 7.5% simple interest. How long will it take for the balance of the account to be $6500?

salantis [7]

Hi there! So, the simple interest is 7.5% annually. Let’s multiply by initial amount by the interest rate. 5,000 * 7.5% is 375. You earn $375 in interest annually. The difference of 6,500 and 5,000 is 1,500. Let’s divide by 375 to see how many times it goes into 1,500. 1,500/375 is 4. It will take 4 years for the balance of the account to be $6,500.

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3 years ago