System of Equations

T

Tara Marie

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May 29, 2020
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Solve the system . { x+2y-4z=12, 2x+3y+2z=19, 2x+y+6z=17 .
Solve the system .{4x+6y=20, 6x+9y=30 .

Can anyone help? These are hard for me. They are seperated by commas.
 
Tara Marie said:
Solve the system . { x+2y-4z=12, 2x+3y+2z=19, 2x+y+6z=17 .
Solve the system .{4x+6y=20, 6x+9y=30 .
Click to expand...
Tara, this is a perfect example of why anyone who post a question here should give some context for the question as well as context for their own situation. I for one see little reason for these questions beyond busy-work..
UNLESS, the class is able to understands the use of matrices, determinate & inverses.
Then look at this link. That is the solution. You may well have no idea what that means.
If you had told us more about the context we could better help.
 
1st problem

Step 1) Pick two equations and one variables

Step 2) Using the two equation from above eliminate the variable from above. This will give you one equation with two unknowns

Step 3) Using one equation from step 1) (you can pick either one) and the equation you did not use in step 1) eliminate the same variable you eliminated in step 2). This will give you a 2nd equation with two unknowns.

Step 4) Using the two equations you found in step 2 and step 3 solve for both variables.

Step 5) Pick any of the three original equations and solve for the 3rd variables using the results you found in step 4)

Step 6) Check you answer.

Now you have the steps so please show us your work.
 
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