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GaryK [48]
3 years ago
12

Solve the equation. Check for extraneous answers

Mathematics
1 answer:
Lady bird [3.3K]3 years ago
7 0
The answer is A i hope this helps 
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Elimination
SVETLANKA909090 [29]
2x -  4y + 1z = 11 ⇒ 2x - 4y + 1z = 11
1x + 2y + 3z = 9   ⇒ <u>1x + 2y + 3z = 9</u>
3x         + 5z = 12       1x - 2y - 2z = 2
                                                                     1x -  2y - 2z = 2
2x -  4y + 1z = 11                                        <u>-2x + 2y - 2z = -3</u>
1x + 2y + 3z = 9   ⇒ 1x + 2y + 3z = 9                    x - 4z = 1
3x         + 5z = 12 ⇒ <u>3x         + 5z = 12</u>          x - 4z + 4z = 1 + 4z
                                 -2x + 2y - 2z = -3                         x = 1 + 4z
                                                     <u />          1 + 4z - 2y - 2z = 2<u />
                                                               1 - 2y + 4z - 2z = 2
                                                                      1 - 2y + 2z = 2
                                                                    <u>- 1                 - 1</u>   
                                                                          -2y + 2z = 1
                                                                   -2y + 2z - 2z = 1 - 2z
                                                                                  <u>-2y</u> = <u>1 - 2z</u>
                                                                                   -2        -2
                                                                                     y = -0.5 + z
                                                         x + 2(-0.5 + z) - 2z = 2
                                                            x - 1 + z - 2z + 2 = 2
                                                                         x - 1 + z = 2
                                                                         <u>  + 1       + 1</u>
                                                                              x + z = 3
                                                                         x - x + z = 3 - x
                                                                                    z = 3 - x
                                                                      
                                            
<u />
4 0
3 years ago
Sketch the graph for each function. Choose either A, B, C, or D.
Serjik [45]
Hi. Here it is!
I hope this help...

—> And the answer is letter A

6 0
2 years ago
The width of a rectangle, in feet, is represented by (3x-1). The length of the rectangle, in feet, is represented by (1.5x+3). F
bogdanovich [222]
Answer: 4.5x + 2

Explanation:

Sum of length and width = (3x-1)+(1.5x+3)
= 3x - 1 + 1.5x + 3
= 4.5x + 2
7 0
3 years ago
A researcher read a 12-page article in 30 minutes. On
neonofarm [45]
Answer: 2.5 minutes

Explanation: Divide the time by the amount of pages to find the amount of time spent of each page. (30/12=2.5)
3 0
3 years ago
The sum of three different numbers is 18. If every number is a prime number, what are the three numbers?
alexdok [17]
The sum of three primes is 18 so they must all be smaller than 18 as well.

Primes less than 18=2,3,5,7,11,13,17

2,3, and 13

2,5, and 11

There are two solutions...


3 0
3 years ago
Read 2 more answers
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