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r-ruslan [8.4K]
2 years ago
13

Please help me solve this.

Mathematics
2 answers:
Doss [256]2 years ago
7 0

Answer:

63

Step-by-step explanation:

elena55 [62]2 years ago
7 0
The answer is 63. Good luck!
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X+y+z=−4<br> 2x+3y−2z=10<br> −x+2y−3z=−12 <br> solve for x,y,z<br> WILL MARK BRAINLIEST!!!
Norma-Jean [14]

Answer:

x = 13

y = -10

z = -7

Step-by-step explanation:

x+y+z=−4

2x+3y−2z=10

−x+2y−3z=−12

Add the first and the third equations to eliminate x

x+y+z=−4

−x+2y−3z=−12

--------------------

  3y -2z = -16  Equation A

Add the second and twice the third equation to eliminate x

2x+3y−2z=10

−2x+4y−6z=−24

----------------------------

     7y -8z = -14  Equation B

Take Equation A and multiply by -4

-4*(  3y -2z) = (-16)*-4

-12y + 8z = 64

Add this to Equation B

-12y + 8z = 64

 7y -8z = -14

-----------------------

-5y = 50

Divide by -5

-5y/-5 = 50/-5

y = -10

Now using equation A

  3y -2z = -16  

3*-10 -2z = -16

-30 -2z = -16

Add 30 to each side

-2z = -16+30

-2z = 14

Divide by -2

-2z/-2 = 14/-2

z = -7

Now find x using the first equation

x+y+z = -4

x -7-10 = -4

x -17 = -4

Add 17 to each side

x-17+17 = -4+17

x = 13

7 0
3 years ago
If DEF and MNO are two triangles such that DE=MN and EF=NO, which of the following would be sufficient to prove that triangles a
Delvig [45]

Answer:

  D.  ∠E ≅ ∠N

Step-by-step explanation:

The pair of sides meet at vertex E in ∆DEF and at vertex N in ∆MNO. Since the sides that make up angles E and N are shown congruent, it is sufficient to show ...

  ∠E ≅ ∠N

Then the SAS congruence postulate can be claimed.

__

<em>Additional comment</em>

The alternative is to show DF ≅ MO. That would allow you to claim SSS congruence. That is not an answer choice.

3 0
2 years ago
2. through: (8,5), perpendicular to y=-1/2x +4
SCORPION-xisa [38]
Perpendicular slope: flip sign and reciprocal = 2
Y = 2x + b
Plug in point (8,5)
5 = 2(8) + b
5 = 16 + b
b = -11
Equation: y= 2x - 11
7 0
3 years ago
How do you turn 72.1 repeating number into a fraction?
SCORPION-xisa [38]
72 1/9

0.1 recurring of the number 1 is 1/9 of the number 
5 0
2 years ago
The length of the bed of Deans truck is 76inches. What is the length of the bed of Deans truck in yards
sergejj [24]

Answer:

Roughly 2.11 or 19/9 yards

Step-by-step explanation:

76 inches divided by 12 equals 6.33 feet

6.33 feet divided by 3 equals 2.11 yards.

5 0
2 years ago
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