



 
Hi Kim, I will o a similar problem
I am going to use the method of elimination and the first task is to decide which variable to eliminate first. When I look at the coefficients I see that if I subtract the first and third equation then x is eliminated so I am going to eliminate x. Subtract equation (3) from equation (1) to get
Multiply equation (1) by 2 and subtract from the equation (2)
Multiply equation (5) by 3 and subtract from equation (4)
and hence
Substitute z = 2 into equation (5) to get
and thus
Finally substitute y = 5 and z = 2 into equation (1).
and hence
Now try your problem,  


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