## anonymous 4 years ago How do you do 3x+3y+z 5x+2y+2z=7 3x-2y+3z=-9 for x,y,z?

1. anonymous

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2. anonymous

They are a system of equations. First, find the value of one of the variables, say, x, relative to another variable, like if I had $y = 3x+4$ and $y = 8x -3$ the first one would become $x= \frac{ y-4 }{ 3 }$ and then you substitue that x value into the second equation, making it $y = 8(\frac{ y-4 }{ 3 }) - 3$ Now you can solve for y. Similarly, these equations you also solve for x, y and z, but here, for the first equation, the equation doesn't equal anything. I think you should fix it.