3x+2y-z=0
x-y+5z=2
2x+3y+3z=7

I need helping solving this three system linear equation.

The graph of f(x) is obtained by reflecting the graph of f(x)=-3|x| over the x-axis. which equation describes f(x)? a) f(x)=3|x| b) f(x)=|x+3| c) f(x)=-3|x| d) f(x) = - |x+3|