Question

What is the solution of the system of equations?

Answer 1

eliminate variables one by one...

Answer 2

ok...

Answer 3

solved

Answer 4

solved?

Answer 5

is there a specific method you need to solve this?

because i would use cramer's rule or put it to rref to solve this

Answer 6

No:/ It just says that I need to solve the system. What's cramer's rule?

Answer 7

cramer's rule is from linear algebra im assuming you're not suppoed to do it that way if they didnt teach your it

im thinking your prob gonna need to do it the long way

Answer 8

Oh joy the long way. Okay can you help me with it?

Answer 9

I did a system of equation...

Answer 10

so first eliminate the x's and y's by subtracting equation 1 from 3

Answer 11

and so you get -2z=6. hence z=-3

Answer 12

plug it back into the equations to get new equations:
5x+5y=15
and 3x+2y=10

Answer 13

now solve for y by eliminating x :D

Answer 14

i just let jeff handle it since im a lazy retrice

Answer 15

lol thanks anyways jay:)

Answer 16

cramer's rule takes forever. I only use it if I ABSOLUTELY ABSOLUTELY need to. I know it has something to do with computer programming

Answer 17

So y would be 1? And I don't even know what cramer's rule soo...yeah

Answer 18

cramer's rule is really much faster, it can be done in a few mins when you know how to do it

but since this problem was easy to cancel out the variables the normal method would of worked faster

Answer 19

yes y is 1 now use y and z to solve for x

Answer 20

So it would be: (2,1,-3)?

Answer 21

Omg I understand what you were saying in history chat now-_- lol

Answer 22

correct im probably going to sleep. Not being productive anymore

Answer 23

Thank you guys!!!<3

Answer 24

fml lol

Answer 25

sure lol

Answer 26

just want to note theres a small mistake with the answer

5x+5y=15 --> 15x + 15y = 45
3x+2y=10 --> - 15x - 10y = -50
--------------------------------
0 +5y = -5
y = -1

Answer 27

...aw:( So that messes up the whole problem

Answer 28

not necessarily since y= -1, you can plug it in to 5x + 5y = 15
to get your x value and then plug it in to

3x+2y+3z=1
to get your z value

Answer 29

Oh okay