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
Gennadij [26K]
3 years ago
5

Help please hurry please

Mathematics
1 answer:
DIA [1.3K]3 years ago
5 0
I have no idea sorry btw I would skip it if I were you because it is only worth 1 point
You might be interested in
Solve the system of equations.
Xelga [282]

Answer:

  b.  x=1, y=2, z=3

Step-by-step explanation:

The system of equations ...

  • 3x +2y +z = 10
  • 9x -6y +z = 0
  • x -y -3z = -10

has solution (x, y, z) = (1, 2, 3) . . . . matches choice B.

_____

While it is convenient to solve this using a graphing calculator or web site, one can easily solve the system by hand.

Subtract the second equation from 3 times the first:

  3(3x +2y +z) -(9x -6y +z) = 3(10) -(0)

  12y + 2z = 30 . . . . simplify

Dividing this result by 2 gives ...

  6y +z = 15 . . . . . . [eq4]

Subtract 3 times the third equation from the first:

  (3x +2y +z) -3(x -y -3z) = (10) -3(-10)

  5y +10z = 40 . . . . simplify

  y + 2z = 8 . . . . . . . divide by 5 . . . . . [eq5]

The two equations [eq4] and [eq5] can be solved any of the ways you usually solve two equations in two variables. Here, we'll use the first equation to write an expression for z that we can substitute into the second equation.

  z = 15 -6y . . . . . subtract 6y from [eq4]

  y + 2(15 -6y) = 8 . . . . . substitute for z in [eq5]

  -11y +30 = 8 . . . . . simplify

  -11y = -22 . . . . . . . subtract 30

  y = 2 . . . . . . . . . . . divide by the coefficient of y

  z = 15 -6(2) = 3 . . . . substitute for y in our equation for z

Substituting these values for y and z into the third original equation gives ...

  x - 2 -3(3) = -10

  x -11 = -10 . . . . . . . . simplify

  x = 1 . . . . . . . . . . . . add 11

The solution to the above system of equations is (x, y, z) = (1, 2, 3).

_____

<em>Comment on the problem statement</em>

Math is generally unforgiving of imprecision. The given system of equations has no variable "z", and some other typos are apparently involved. That is why we rewrote the system to the equations shown above.

It is very easy to mistake z for 2, or g for 9, or o for 0, or 1 for 7. There are other confusions that are possible, as well. Letters I (eye) and l (ell) are easily confused, and may be confused with 1 (one) as well. Sometimes y and 4, or 4 and 9, can also be written so as to be difficult to tell apart. Great care must be taken when handwriting these symbols.

7 0
3 years ago
Factorise the following 4(x-1)²-9 need solution
kumpel [21]

Answer:x= 5/2 x= -1/2


Step-by-step explanation:

4(x-1)2-9

4(x2-2x+1) - 9

4x2 - 8x + 4 - 9

4x2 - 8x - 5

4x2 +2x - 10x - 5

2x(2x+1) - 5(2x+1)

(2x-5)(2x+1)

therefore, x= 5/2 x= -1/2




mark brainliest plzz

6 0
3 years ago
A line passes through the points......​
Kobotan [32]
Should be the first one
8 0
2 years ago
Read 2 more answers
Which of the following best shows the associative property of multiplication?
Marizza181 [45]

Answer:

(4 × 3) × 6 = 4 × (3 × 6) shows the Associative Property of Multiplication.

8 0
3 years ago
Read 2 more answers
The question is in the picture
AURORKA [14]

Answer:

B: 0.15

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • Ella spends 2/3 hour practicing the piano each day. She also spends 1/2 hour jogging. What is the common denominator of the frac
    8·1 answer
  • Find the social security tax deducted for each weekly pay check of $237
    10·2 answers
  • Help....it it easy.
    11·2 answers
  • What is the answer for 5.2 × 10-9 + 3.1 × 10-8 = × 10?
    13·1 answer
  • Help me solve this problem and explain how you got the answer plz
    8·1 answer
  • HURRYYY 20 POJNTS GIVING BRAINLYEST CHOP CHOP CHECK MY QWESTIONS
    14·1 answer
  • Which pairs of triangles can be shown to be congruent using rigid motions?
    14·2 answers
  • Plese help for brainlist !!!
    7·1 answer
  • Am I correct? Just check please
    5·1 answer
  • Jack is planning to apply for a new credit card and needs to compare two offers. Complete the table based on the information in
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!