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Marizza181 [45]
3 years ago
8

The value of " X " is...

Mathematics
1 answer:
bulgar [2K]3 years ago
3 0

Answer:

3

Step-by-step explanation:

If you multiply the first equation by 2 and add the second, you eliminate z from the resulting equation.

If you add the first and third equations, you also eliminate z from the result.

Both of these resulting equations will have 3y as their second term, so you can subtract the first result from the second to eliminate the y variable and find the value of x.

This process has a shortcut. If we call the equations A, B, and C, the first elimination is done by calculating 2A+B. The second elimination calculates A+C. To find x, we compute ...

... (A+C) -(2A+B) = -A -B +C

... -(2x +y -z) -(-x +y +2z) +(3x +2y +z) = -3 -0 +9

... x(-2+1+3) +y(-1-1+2) +z(1-2+1) = 6

... 2x = 6

... x = 3

_____

Since this is a college math question, we presume you have a graphing calculator and are expected to know how to use it. The solution to systems of linear equations on such a calculator is usually pretty simple. A TI-84 can tell you the values of x, y, and z pretty easily: (x, y, z) = (3, -1, 2).

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3 years ago
How many groups of ten are there in 230?
Artyom0805 [142]

Answer:

I am pretty sure the answer is 23

Step-by-step explanation:

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4 0
3 years ago
Javier had $305 in his bank account. His bank charges a fee of $7.50 each month that a balance is below $500. If he makes no oth
Likurg_2 [28]
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8 0
3 years ago
Read 2 more answers
Problem Solving
N76 [4]

you're absolutely correct.

each system is sold for $2150, that includes cost + markup, namely the markup is the surplus amount otherwise called "profit".

they sold 12 of those, 2150 * 12 = 25800

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25800 - 4824.36 = 20975.64

that's the cost for all 12 systems sold, how many times does 12 go into 20975.64?  20975.64 ÷ 12 = 1747.97.

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3 years ago
A 20 packet box of detergent sells for $5.49. What is the unit rate
jolli1 [7]

Answer:$0.27

Step-by-step explanation:

20=$5.49

1=20/5.49

1=$0.2745

6 0
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