Question

help please !!!!

Answer 1

The strategy is to reduce this to two equations in two unknowns.
Do that by eliminating one of the unknowns from two pairs of equations: either from equations 1) and 2), or 1) and 3), or 2) and 3).

Answer 2

One step would be :

Multiply equation 3 by 2 throughout and add with equation 1.

This will eliminate x.

Similarly find other ways...

Answer 3

@marcelie In your work, which variable did you think you would eliminate first?

Answer 4

the z's?

Answer 5

If you have not started on the problem, then I'll begin with the intent to eliminate the x variable.

Take equation #2 and equation # 3

2) -3x + 2y + z = 11 -3x + 2y + z = 11
3) -x + 5y + 3z = 4 --Multiply by -3 ---- 3x - 15y - 9z = -12
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@marcelie What do you get when you
add the two equation on the far right?

Answer 6

i got x= -45/13 and y = 17/13

Answer 7

how do i find z ?

Answer 8

i solved the equations

Answer 9

my question is how do i find z?

Answer 10

they are the same o.o

Answer 11

I will tell you how to find z.

Take any one of the three equations. Substitute in for what you got for x and y.
Crank out the value of z.

For example,

2) -3x + 2y + z = 11

-3(-135/37) + 2(-7/37) + z = 11

Solve for z.

If what you sub in for x and y are incorrect, z will also be incorrect.

Answer 12

thats what i got for x and y

Answer 13

x= -45/13 and y = 17/13

Answer 14

my answer sheet says thats the answer o.o

Answer 15

and i got that x.x

Answer 16

i tried find z but doesnt give me the answer

Answer 17

Okay. Go ahead and use those to find z.

Answer 18

This will. Use it:

-3(-135/37) + 2(-7/37) + z = 11

Answer 19

i solved for z and i got - 2

Answer 20

aight got it xD ty

Answer 21

So, the answer is ( -45/13, 17/13, -2 )

Answer 22

yes

Answer 23

i worked it out and gave me exact answers