exam Maths Puzzle Numerical Ability

I need assistance with solving and showing how this is solved.
x+2y+z=7
2x-y-z=2
3x-3y+2z=-5

Solve by the echelon method and then by the Gauss-Jordan method. Thank you in ad

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Hi and thank you for your help if you can.

My problem is an intermediate algebra problem

2-3[-4+6]/(-2) Simplify.

Nichell Bailey p.s I never know where to begin first. Evaluating Functions: Evaluate the function for the given value of x.
f(-4)

f(x)={5x-1, if x<-2
{x-9, if x>_ (greater than or equal to)-2