1. ## Algebraic Method

Solve the following system of equations using an algerbraic method. Check your answer.

3x=-12
1=x+y+2z
2x-y=-9

How would someone go about doing this

2. Originally Posted by mcinnes
Solve the following system of equations using an algerbraic method. Check your answer.

3x=-12
1=x+y+2z
2x-y=-9

How would someone go about doing this
Are you intending on isolationg the variables or solving to see where they intersect?

3. isolating and finding out what they are would probably be best dude

4. Originally Posted by mcinnes
Solve the following system of equations using an algerbraic method. Check your answer.

3x=-12
1=x+y+2z
2x-y=-9

How would someone go about doing this
Solve the first equation for x. That should be easy.

Substitute that value into the 3rd equation and solve for y. That shoudl be easy, too.

Finally, substitute x and y values in 2nd equation to find z.

Finished!

5. Originally Posted by masters
Solve the first equation for x. That should be easy.

Substitute that value into the 3rd equation and solve for y. That shoudl be easy, too.

Finally, substitute x and y values in 2nd equation to find z.

Finished!
Solve the following system of equations using an algerbraic method. Check your answer.

3x=-12
1=x+y+2z
2x-y=-9

How would someone go about doing this
3x=-12
x=-12/3
x=-4

2(-4)-y=-9
-8-y=-9
-y=-9+8
-y=-1
y=-1/-1
y=1

1=-4+1+2z
1+4-1=2z
4=2z
4/2=z
z=2