1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tankabanditka [31]
3 years ago
12

PLEASE HELP ASAP 25 PTS + BRAINLIEST TO RIGHT/BEST ANSWER

Mathematics
2 answers:
IgorC [24]3 years ago
4 0

\left\{\begin{array}{ccc}-3x-y+z=6\\-3x-y+3z=0\\x-3z=3&|\text{add 3z to both sides}\end{array}\right\\\\x=3+3z\\\\\text{Substitute it to the first and the second equation:}\\\\\left\{\begin{array}{ccc}-3(3+3z)-y+z=6\\-3(3+3z)-y+3z=0\end{array}\right\\\\\text{use distributive property}\\\\\left\{\begin{array}{ccc}-9-9z-y+z=6&|\text{add 9 to both sides}\\-9-9z-y+3z=0&|\text{add 9 to both sides}\end{array}\right\\\\\text{combine like terms}

\left\{\begin{array}{ccc}-8z-y=15\\-6z-y=9&|\text{change the signs}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}-8z-y=15\\6z+y=-9\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad-2z=6\qquad\text{divide both sides by (-2)}\\.\qquad\boxed{z=-3}\\\\\text{Put the value of z to the second equation:}\\\\6(-3)+y=-9\\-18+y=-9\qquad\text{add 18 to both sides}\\\boxed{y=9}\\\\\text{Put the value of z to the equation}\ x=3+3z:\\\\x=3+3(-3)\\x=3-9\\\boxed{x=-6}

Answer:\ \boxed{x=-6,\ y=9,\ z=-3\to(-6,\ 9,\ -3)}

mash [69]3 years ago
3 0

Answer:

(-6,9,-3)

Step-by-step explanation:

-3x -y +z=6

-3x-y+3z =0

x-3z =3

Multiply the second equation by -1

-1 *(-3x-y+3z) =0*-1

3x +y -3z =0

Add this to the first equation

-3x -y +z=6

3x +y -3z =0

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

0 + 0 + -2z = 6

Divide by -2

-2z/-2 = 6/-2

z = 6/-2

z=-3


Take the third equation to find x

x-3z=3

x-3(-3) = 3

x+9=3

Subtract 9 from each side

x+9-9 =3-9

x=-6

Now we need to find y

3x +y -3z =0

3(-6) +y -3(-3) =0

-18 +y +9=0

-9+y =0

Add 9 to each side

-9+9+y = 0+9

y=9

(-6,9,-3)

You might be interested in
Graph the line y = 3x
ollegr [7]

Answer:

literally google graphing calculator and type 3x

7 0
2 years ago
Read 2 more answers
Find the unit rate for 50 miles on 2 1/2 gallons
Anarel [89]
Unit rate is miles per 1 gallon
50mi/2 and 1/2 gallon
50mi/2.5 gallon
times 10/10
500mi/25 gallon
20mi/1gallon

answer is 20mi/gal
6 0
3 years ago
This quiz it is rlly hard
lawyer [7]

Answer:

396cm I think.

Step-by-step explanation:

10 x (27 - 8) + 9 x 24

4 0
2 years ago
Help please ASAP : if Kayla gets 193$ at promotion 37, how much money does she get at promotion 50?​
ololo11 [35]
The answer is 260.810811
5 0
3 years ago
Which statements are correct interpretations of this graph?
gogolik [260]
Looking at the graph, we know that A. 3 boxes are filled every 4 min and D. 0.75 boxes are filled per minute are the correct answers.
Hope this helps~
7 0
3 years ago
Read 2 more answers
Other questions:
  • Simplify 3x+2=x-2 and show your work
    9·2 answers
  • I Really Need Help With This Problem, Please
    10·2 answers
  • Whats the sales price of jeans if the cost 50$ and the discount is 15%
    10·1 answer
  • Which of the following is NOT a way to prove triangles similar?
    12·1 answer
  • The length of a rectangle is 6 times its width. the perimeter has to be more than 110 feet. What inequality can be solved to fin
    11·2 answers
  • Divide 4 2/3 divided by 1 2/3
    14·1 answer
  • Please help. Also show how you got it thanks!
    10·1 answer
  • Please help me!! Find the area of each triangle (A-D). Show your reasoning.
    7·1 answer
  • What is the surface area of the figure below? Round your answer to the nearest whole number.
    9·2 answers
  • A four pack of batteries costs $3.45. A six pack of batteries costs $4.80. Which is a better deal? Unit price.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!