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eimsori [14]
2 years ago
7

So I need help with this. Why Do we seat?​

Mathematics
1 answer:
r-ruslan [8.4K]2 years ago
6 0

Answer:

When we stand our muscles are working a little bit, and if we're moving around, our muscles are working even more, so we sit down to take a little bit of a break, but the problem starts when we sit down for too long. ... If we sit for too long, it's not good for our heart.

Step-by-step explanation:

hope this helps

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Is my answer correct?
Black_prince [1.1K]

No, we do not multiply the first equation by 2 and then add it to the second equation. We have to multiply the first equation by 4.

To illustrate this point, consider system A:

\left\{ \begin{aligned}x - y &= 3 \\-2x + 4y &= -2\end{aligned}\right.

If we multiply the first equation by 2, we get

2x - 2y = 6

Now, if we replace the second equation with the sum of the second equation and 2x - 2y = 6, we get

\left\{ \begin{aligned}x - y &= 3 \\(-2x+2x) + (4y - 2y) &= -2 + 6\end{aligned}\right.

which simplifies to

\left\{ \begin{aligned}x - y &= 3 \\2y &= 4\end{aligned}\right.

This is not an equivalent system to System B. We can see that we ended up with a 2y = 4 equation.

In order to end up with a 2x = 10 second equation, we have to multiply the first equation of system A by 4 to get

4x - 4y = 12

If we replace the second equation with the sum of the second equation and 4x - 4y = 12, we get

\left\{ \begin{aligned}x - y &= 3 \\(-2x+4x) + (4y-4y) &= -2 + 12\end{aligned}\right.

which simplifies to

\left\{ \begin{aligned}x - y &= 3 \\2x &= 10\end{aligned}\right.

Otherwise, you are correct. The solution to system B is the solution to system A. Adding an equation to another does not change the system.

4 0
3 years ago
Simplify: 6(2x-3)-(5x+7)
Gelneren [198K]
First I would distribute the left part like so:
12x - 18 - (5x + 7)

Then I would distribute the right side like so: (I'm just distributing a negative sign)
12x - 18 - 5x - 7

Then I combine like terms like so: (12x and -5x)
7x - 18 - 7

Then I would combine the other like terms like so: (-18 and -7)
7x - 25


I hope that helps! Feel free to let me know if you have any questions! :3

- mathwizzard3
5 0
2 years ago
-7(2x-3) equivalent expression
ollegr [7]

Answer:

-14x+21

Step-by-step explanation:

-7(2x-3)

-14x+21

5 0
2 years ago
Read 2 more answers
Kalon has $175 and needs to save at least $700 for a new computer. If he can save $35 per week, what is the minimum number of we
lora16 [44]
The minimum would be 15. I'm sorry if I'm wrong, but I'm pretty sure that's the answer.
8 0
3 years ago
Read 2 more answers
Help me with pre algebra worth 50 points
Lisa [10]

The total number of rocks collected:

r + 2r + 2r - 5

Rocks collected by Maria and Javier:

3r

The difference between the number of rocks collected by Pablo and Maria:

r - 5

The sum of rocks collected by the boys:

4r - 5

The number of rocks collected by Pablo and Maria:

r + 2r - 5

4 0
2 years ago
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