Solve the following system of equations.

3x + 3y + 2z = -5
x + y + 3z = -4
2x + 2y + 5z = -7

A. (-4, -3, 1)
B. (-4, 3, -1)
C. (4, -3, -1)
D. (-4, -3, -1)

Question

Solve the following system of equations.

3x + 3y + 2z = -5
x + y + 3z = -4
2x + 2y + 5z = -7

	 A. (-4, -3, 1)	
	 B. (-4, 3, -1)	
	 C. (4, -3, -1)	
	 D. (-4, -3, -1)

anonymous · Answer

@Hero can you help me

anonymous · Answer

@zepdrix

zepdrix · Answer

Umm have you learned about matrices? :o

anonymous · Answer

Yes although I struggled with it but I have learned it. @zepdrix

zepdrix · Answer

You could write the system as a matrix and try to get it in Row Reduced Eschelon Form.$$\Large\rm \left(\begin{array}{rrr|r}3&3&2&-5\ 1&1&3&-4\2&2&5&-7\end{array}\right)$$Remember with the zeroes and only 1's along the diagonal? :d

Or you prefer other method maybe?
Like substitution or something?

anonymous · Answer

Yea I don't remember it like that? @zepdrix

anonymous · Answer

That would be D

muzzack · Answer

@solver explain why

anonymous · Answer

This website explains it all http://www.algebrahelp.com/calculators/equation/ Don't worry, it doesn't tell you the answer directly, it gives out steps.