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kykrilka [37]
3 years ago
10

Mark is solving the following system.

Mathematics
2 answers:
fredd [130]3 years ago
6 0
I think its he didnt eliminate the same variables
miskamm [114]3 years ago
6 0

Solving the system of linear equations Mark tries to apply elementary transformations in order to eliminate one variable.

He makes such steps:

1. He multiplies equation (1) x+y+z=2 by 7 and adds it to equation (3) 4x-y-7z=16. This gives him:

7x+7y+7x+4x-y-7z=14+16,

11x+6y=30.

2. He multiplies equation (3)  4x-y-7z=16 by 2 and adds it to equation (2) 3x+2y+z=8. This step gives him:

8x-2y-14z+3x+2y+z=32+8,

11x-13z=40.

Thus, he did not eliminate the same variables in steps 1 and 2.

Answer: correct choice is C

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Question 5 of 8<br> In arithmetic, variables look like<br> Answer here<br> SUBMIT
Musya8 [376]

Answer:

In arithmetic, variables look like letters.

Step-by-step explanation:

As we know that Mathematical arithmetic deals with numbers and certain properties with them.

Some of the main properties between numbers are as follows:

  • Addition
  • Subtraction
  • Multiplication
  • Division

Variables do not remain constant, so we basically assign a number to a variable with an equal operator denoted by '='.

For example, let us assume a variable x being equal to 7. so it can written as:

x = 7

Let suppose the value of the variable x=7 changes to x=10, then the new value will be:

x = 10

Therefore, the correct answer is:

In arithmetic, variables look like letters.

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3 years ago
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Evaluate the limit as x approaches 1 of the quotient of the square root of the quantity x squared plus 3 minus 2 and the quantit
IgorLugansk [536]
A graph shows the limit to be 1/2.
https://www.desmos.com/calculator/qrf6ay47tw

Since the value of the function is the indeterminate form 0/0, L'Hôpital's rule applies. The ratio of derivatives of numerator and denominator is
.. x/\sqrt{x^{2}+3 }
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3 years ago
I do believe i need help.
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A

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Answer:

x < -20

Step-by-step explanation:

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7 0
3 years ago
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