Someone please help me with this matrices problem!!! Will medal and fan!

Question

anonymous · Answer

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anonymous · Answer

Just use logic. Test out numbers and see which ones fit.

anonymous · Answer

ya I was going to do that but I its not multiple choice and I'm not sure how to use matrices to solve the problem...

anonymous · Answer

It doesn't need to be multiple choice. I already figured out what x, y, and z are just by using logic.

anonymous · Answer

I'll give you a couple of tips. In the second line, you notice that 4x and 5y added only get 3, so that means either x or y is negative. In the third line, you notice that y minus-3 times z is -10 so that means y is a small number and z is definitely positive.

anonymous · Answer

I know but I have to write out each step using matrices to get credit...

anonymous · Answer

Oh

anonymous · Answer

hate systems like that

anonymous · Answer

ya me too... anyway thanks for trying to help

misty1212 · Answer

HI!!

misty1212 · Answer

this is very long and annoying
you have to use some sort of elimination

misty1212 · Answer

i would cheat if it was me

misty1212 · Answer

you can multiply the first equation by $-4$ and add it to the second
that will eliminate the $x$ terms, then you will be left with two equations and two unknowns

anonymous · Answer

You didn't read my previous comment did you? I have to show my work with the matrices to get credit

misty1212 · Answer

$$-4x-4y-4z=-16\
4x+5y=3$$ add and get oh i see 
are you supposed to row reduce the matrix? it is really the same thing exactly

anonymous · Answer

I'm not sure...