



 
Hi Alfredo. That's a really good start. Now you need to start eliminating variables until you can find the value of one of them. Here's how I would continue from where you left off: Rewrite the equations as
Eliminate z by using the first and third equations. Multiply the third equation by 8 to get
Add this equation to the first equation to obtain
Now eliminate y by multiplying the above equation by 3, multiplying the second equation by 5 and adding the equations. This will give you one equation to solve for x. This system however is much easier to solve using the substitution method. Starting with the system you developed
z = 2x, so z = 2 (3y) = 6y. 3x + 5y + 8z = 2542, so 3 (3y) + 5y + 8 (6y) = 2542 Find y. Use y to find x, then x to find z. Hope this helps,  


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