Question

2x+3y+z=-5
x+2y-z=-6
3x+y+2z=4

Answer 1

I am not god at all I have failed this 3 times not good

Answer 2

good

Answer 3

can be solved by a number of methods .
Starting with elimination method.
Multiply 2nd eqn with 2 and subtract from 1st. You'll get an equation with 2 variables. Repeat the process with any other pair of equations. Then solve simultaneously.

Answer 4

do u always mult 2nd equation by 2

Answer 5

no

Answer 6

you have to choose a pair of equations and then determine which constant(number) to multiply, so that one variable will cancel out in elimination

Answer 7

ok i will try that thanks

Answer 8

x = 1.5
y = -3.1
z = 1.29999....

if i used my ti83 right :)

Answer 9

i am still lost i am not good at tis at all thx i have to do every step the book does give the ans but says no solution

Answer 10

every step eh; there are a few ways to solve this, which one are you trying?

Answer 11

elim but what ever will be the best

Answer 12

2x +3y + z = -5
x +2y - z = -6
3x + y +2z = 4

Notice that these 2 equaions can eliminate a z

2x +3y + z = -5
x +2y - z = -6
-----------------
3x +5y = -11

so lets continue eliminating zs :)

x +2y - z = -6 ; multiply this one by 2 to get
2
----------------
2x+4y -2z = -12 ; now add together
3x + y +2z = 4
-----------------
5x +5y = -8

hows that so far?

Answer 13

ok that is great

Answer 14

the 2 is a neg x i typed it wrong

Answer 15

this leaves us with 2 new equations to work on

3x +5y = -11 ;there is a 5y in both so lets eliminate those
5x +5y = - 8 ; by muliplying one of them by (-1)


3x +5y = -11
-1
-------------
-3x -5y = 11
5x +5y = - 8 ; now add em :)
-------------
2x = 3 ; and solve for x

x = 3/2 = 1.5

Answer 16

-x+2y-z sorry

Answer 17

the steps are the same regardess of the numbers; just correct for it :)

Answer 18

ok

Answer 19

when we correct for that little typo we get:

x +5y = -11
x +5y = - 8

these are the same equations but with different paths; in other words they are parallel lines the will never meet.

When lines dont meet there cant be a point they have in common for a solution :)

Answer 20

ok

Answer 21

u r really good at this

Answer 22

I can be :) at other times i really mess it up lol

Answer 23

i have a midterm wed and i know i probally will not pass it

Answer 24

this is my 3rd time

Answer 25

i am taking it online and it is harder than class

Answer 26

college algebra was a breeze for me. oh yeah, online stuff is the pitts

Answer 27

now i am in big trouble

Answer 28

we take a test at the school so i cant have my notes

Answer 29

64m^3x-8n^3x=