Question

Will fan and medal
Use a graphing calculator or spreadsheet software to solve 4x + y + z = 1
8x – 4y – 7z = 2
5y + 9z = 3
using matrices
A. (0.5, -3, 2)
B. (1, 2, 3)
C. (-3, 0.5, 2)
D. (0.5, 3, 2)

Answer 1

these are 3 planes, yep:

\(4x + y + z = 1 \\
8x – 4y – 7z = 25 \\
0 x + y + 9z = 3\)

any idea what the "answer" means ? :p

Answer 2

Don't you solve for x, y, and z?

Answer 3

what grade is this?

Answer 4

@pokamons

Answer 5

It's algebra 2

Answer 6

im in geometry but i can try

Answer 7

oka

Answer 8

im sorrry, idk this :(

Answer 9

Hey it's all good. I don't know this either.

Answer 10

But thanks for trying anyway

Answer 11

I think you are supposed to do something like this:

+++++++++++++++++
import numpy as np

a = np.array( [ [4,1,1], [8,-4,-7], [0,5,9] ] )

b = np.array([1,2,3])

x = np.linalg.solve(a, b)

print x

+++++++++++++++++

Connected to pydev debugger (build 141.1899)
[ 0.5 -3. 2. ]


it says: "graphing calculator or spreadsheet software "

Answer 12

it certainly assumes some knowledge

if that is lacking, we can have a crack at solving just 2 of them:

\(4x + y + z = 1; \\
8x – 4y – 7z = 2\)

Answer 13

or these:
\(8x – 4y – 7z = 2 \\
5y + 9z = 3\)

Answer 14

[0.5, -3, 2] is correct. I just guessed and got 100%

Answer 15

awesome, telepathic!!!

Answer 16

Thank you for your help!