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3 years ago

What is the answer to this promblem

Mathematics

2 answers:

galina1969 [7]3 years ago

7 0

9514 1404 393

Answer:

to eliminate x: multiply the first by 3, and the second by -4
to eliminate y: multiply the first by 2, and the second by 5

Step-by-step explanation:

Pick the variable you want to eliminate. Determine the coefficients of that variable in the two equations. Negate one of them. Multiply each equation by the coefficient that came from the other equation.

<u>To eliminate x</u>

The x-coefficients are 4 and 3. If we negate 4, then the resulting y-coefficient will be positive. We choose to multiply the first equation by 3, the second by -4.

Here is the result of adding those:

3(4x +5y) -4(3x -2y) = 3(7) -4(-12) ⇒ 23y = 69

<u>To eliminate y</u>

The y-coefficients are 5 and -2. If we negate -2, then the resulting x-coefficient will be positive. We choose to multiply the first equation by 2 and the second by 5.

Here is the result of adding those:

2(4x +5y) +5(3x -2y) = 2(7) +5(-12) ⇒ 23x = -46

Svetradugi [14.3K]3 years ago

6 0

Answer:

Step-by-step explanation:

to kill x: duplicate the primary by 3, and the moment by -4 to eliminate y: increase the primary by 2, and the moment by 5 Step-by-step explanation: Pick the variable you need to eliminate. Decide the coefficients of that variable within the two conditions. Refute one of them. Increase each condition by the coefficient that came from the other equation. __ To dispense with x The x-coefficients are 4 and 3. On the off chance that we invalidate 4, then the coming about y-coefficient will be positive. We select to increase the primary condition by 3, the moment by -4. Here is the result of including those: 3(4x +5y) -4(3x -2y) = 3(7) -4(-12) ⇒ 23y = 69 To dispose of y The y-coefficients are 5 and -2. If we nullify -2, at that point the coming about x-coefficient will be positive. We select to duplicate the primary condition by 2 and the moment by 5. Here is the result of including those: 2(4x +5y) +5(3x -2y) = 2(7) +5(-12) ⇒ 23x = -46

hope this helps

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2.1W iPod is used for 30 minutes. How much energy does it use

sesenic [268]

Answer:

The energy is 3780 joule

Step-by-step explanation:

we are given

Total power is 2.1 watt

so,

P=2.1 W

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now, we can change in seconds

we know that

1 min =60 seconds

so, we get

$T=30\times 60sec=1800sec$

we know that

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$E=P\times T$

we can plug value

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So,

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3 years ago

Which one got infinite solutions

GalinKa [24]

I think C I’m just in high school so don’t get mad if is wrong I’m good in math tho

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3 years ago

Examine the diagram.<br> What is the value of x?

allochka39001 [22]

Answer:

x = 10

Step-by-step explanation:

Since two angles lie on line M, we know that their sum will be equal to 180. Since we know one the their angles, we subtract 136 from 180 and get 44.

We also know that the sum of all a triangle interior angle together equal 180. We all ready have two of those angles so we can now find the third.

44 plus 90 equals 134.

180 minus 134 equals 46. So now we know the measurement of the last angle.

Now to we have to solve for x.

We know that 4x+6 equal 46, since they both represent the angle of angle L.

Once you solve 4x+6=46, you will get x = 10.

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7 0

3 years ago

Read 2 more answers

PLEASE HELPPP Today in Algebra class, Ethan learned about the expressions (1+ 1/x)^x and e, but he can't remember if (1+1/x)^x g

tester [92]

Part 1

Use your calculator to have it display $e \approx 2.71828182846$ and round that to five decimal places to get $e \approx 2.71828$

<h3>Answer: 2.71828</h3>

=============================================

Part 2

Plug in x = 5 to get

$y = \left(1 + \frac{1}{x}\right)^x\\\\y = \left(1 + \frac{1}{5}\right)^5\\\\y = 2.48832\\\\$

<h3>Answer: 2.48832</h3>

=============================================

Part 3

Now plug in x = 25

$y = \left(1 + \frac{1}{x}\right)^x\\\\y = \left(1 + \frac{1}{25}\right)^{25}\\\\y \approx 2.66583633148742\\\\y \approx 2.665 84\\\\$

<h3>Answer: 2.66584</h3>

=============================================

Part 4

Plug in x = 125

$y = \left(1 + \frac{1}{x}\right)^x\\\\y = \left(1 + \frac{1}{125}\right)^{125}\\\\y \approx 2.70748783321031\\\\y \approx 2.70749\\\\$

<h3>Answer: 2.70749</h3>

=============================================

Part 5

As x gets larger, it appears (1+1/x)^x is getting closer and closer to e = 2.71828 since the sequence of answers (from parts 2 through 4) was 2.48832, 2.66584, 2.70749.

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3 years ago

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Dafna11 [192]

Answer:

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3 years ago