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
Oksi-84 [34.3K]
3 years ago
5

In the solution to this system, what is the value of y? x+y+z=1x+y+z=1 2x+y−z=82x+y-z=8 x−y+z=−5

Mathematics
1 answer:
kirza4 [7]3 years ago
3 0
If you have multiple equations with multiple variables, you can either do clever substitutions, or turn it into a matrix on which you can perform linear combinations or multiplications (Gauss elimination)

1  1   1  1
2  1  -1  8
1 -1   1  -5

(note how the above 3 rows represent the 3 equations, just got rid of the variables, plus sign and equals sign)

subtract row1 from row3, that eliminates x and z from row 3.

1  1   1  1
2  1  -1  8
0 -2   0  -6

divide row3 by -2, that will give y a factor of 1

1  1   1  1
2  1  -1  8
0 1   0  3

The last row now says y=3



You might be interested in
And isosceles triangle has a bird types angle of 21. 21°. The two sides of the triangle reach 17.91 feet long. Find the area of
Luden [163]

17.91*21=376.11

i used one side of the triangle because both sides are equal



8 0
3 years ago
Read 2 more answers
Eighth grade ) T.5 Pythagorean theorem: word problems 87U
Komok [63]

Answer:

The tree is 12 feet tall

Step-by-step explanation:

Let a represent the length of where the bird was sitting to the oak tree

let b represent the height of the tree

let c represent the length at which the bird flew

by pythagoras theorem

c²=a²+b²

b²=c²-a²

b =  \sqrt{ {c}^{2} -  {a}^{2}  }

subtitute in the values

b =  \sqrt{ {15}^{2} -  {9}^{2}  }

b =  \sqrt{225 - 81}

b =  \sqrt{144}

b = 12

7 0
2 years ago
What is the answer to 20x+7=4+6?
AnnyKZ [126]

Answer:

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
A cone has a height of 8 yards and a radius of 3 yards. What is its volume?
alina1380 [7]
<h3>Given:</h3>
  • h= 8 yd
  • r= 3 yd
<h3>Note that:</h3>
  • h= Height
  • r= Radius
<h3>To find:</h3>

The volume of the given cone.

<h3>Solution:</h3>

\large\boxed{Formula:V= \frac{1}{3}\pi{r}^{2}h}

\large\boxed{\red \pi \red = \red 3 \red . \red 1 \red 4}

Let's solve!

Substitute the values according to the formula.

V= \frac{1}{3}×3.14×{3}^{2}×8

\large\boxed{V= 75.36 \: {yd}^{3}}

<u>Therefore, the volume of the given cone is 75.36 cubic yards.</u>

7 0
1 year ago
Help me plsss in need help there is a picture
Kryger [21]

Answer:

Division Expression - 7 ÷ 3

Unit Form - 21 thirds ÷ 3 = 7

Improper Fraction 7/3

Step-by-step explanation:

Hope this helps!! <3

7 0
2 years ago
Other questions:
  • What is a related subtraction fact for 6+8=14
    5·1 answer
  • the population of a town is 2666 200 and growth rate is 1.50 percent .find the population after one year​
    6·1 answer
  • Esteban has a big jar in his room. He has 600 coins total, and 240 of them are pennies
    13·1 answer
  • George collects baseballcards there are 20 in a pack and he has 1000 cards how many packs does he have in all
    10·2 answers
  • There are 250 students in a senior. of the 250 students, 102 are boys. there are 20 senior girls and 18 senior boys on the track
    15·1 answer
  • HELPPP MEE PLSSS<br><br> Find m∠2
    14·1 answer
  • Hi i have a question can younplease help me ​
    12·1 answer
  • What inverse operation do you use to solve for m? <br><br> 11=m - 4
    14·2 answers
  • A 2-column table with 5 rows. Column 1 is labeled Evelyn's Scores with entries 125, 137, 138, 145, 145. Column 2 is labeled Dist
    15·2 answers
  • Which situations described can be modeled by an exponential function?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!