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
Elden [556K]
2 years ago
13

4x+5y-5z=196 -11x-7y+12z=-211 -8x-9y-z=-236 Solve for x y z

Mathematics
2 answers:
Helga [31]2 years ago
7 0

Answer in attachment.

x = -21, y = 46, z = -10

FrozenT [24]2 years ago
3 0
Have you learned matrices yet? I'm going to use that to solve these, please refer to the photos.

I solved the system by using a matrix calculation. The work always needs to be shown and you do that by setting up the matrix like in the first photo and also writing out all your equations. In a TI calculator, to do this you press 2ND-X^-1,GO TO EDIT - [A] - 3×4- now enter the coefficient of the system of equations variables. NOW 2ND MODE- 2ND-X^-1 -GO TO MATH- ALPHA APPS

Now, if you don't know this you may be confuse so after rref([A]) was enter a matrix came up with [1 0 0 -21] in the top row this means x equal -21. So, the next row is y and it came out as [0 1 0 46] so y equals 46 and I'm going to let you figure out what z is by looking at the matrix.

SO... X=-21 Y=46 and Z=-10

Let's Test it

4x + 5y - 5z = 196 \\ 4( - 21) + 5(46) - 5( - 10) = 196 \\  - 84 + 230 + 50 = 196 \\ 196 = 196



You might be interested in
Use the three steps to solve the problem.
Mazyrski [523]
Let's assume a the age of Joe
b the age of James
a=b+10 (1)
2*(a+8)=3(b+8) (2)

==> 2*(b+10+8)=3b+24
==>2b+36=3b+24
==>b=12
==>a=12+10=22
Joe is 22 years's old
James is 12 years's old.



5 0
3 years ago
Help pleaseeeeeghffffffff
Harlamova29_29 [7]

Step-by-step explanation:

TPC and DPC are supplementary angles so

DPC=180-123=57°

6 0
2 years ago
Read 2 more answers
The price of a cup of coffee was $2.40 yesterday. Today, the price rose to $2.65. Round your answer to the nearest tenth of a pe
Ymorist [56]
To find the percent increase you need to first find how much the price went up: 2.65 -  2.4 = .25     Now divide .25 by the original price.
5 0
3 years ago
A cat jumps 5 feet in the span of 2 seconds. Find the unit rate, in feet per second, that the cat is moving at. Express any impr
mr_godi [17]

Divide total distance by total time:

5 feet / 2 seconds = 2 and 1/2 feet per second.

3 0
3 years ago
Triangle ABC , m∠A=45° and c = 16, find b.
zmey [24]

Using the cosine function:

\begin{gathered} \cos (\theta)=\frac{_{\text{ }}adjacent}{_{\text{ }}hypotenuse} \\ so\colon \\ \cos (45)=\frac{b}{16} \end{gathered}

Solve for b:

\begin{gathered} b=16\cdot\cos (45) \\ b=8\sqrt[]{2} \end{gathered}

5 0
1 year ago
Other questions:
  • A school has 500 students and 30 English teachers and 20 math teachers. The ratio between the number of math teachers and the nu
    5·2 answers
  • The sum of two numbers is 28. The first number, x, is three<br> times the second number, y.
    5·1 answer
  • Please help asap 25 pts
    7·2 answers
  • ,......What is, x-3&gt;7
    8·1 answer
  • 5x - 3.3 = 7.2
    6·1 answer
  • X − 7y = 8 for x. and the choices are
    7·1 answer
  • 1
    9·1 answer
  • Solve for : 6−11−13&lt;7−5
    7·1 answer
  • Which of the following expressions is written in scientific notation
    8·1 answer
  • Harlp ok it hard sorry
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!