exam Maths Puzzle Numerical Ability

Use Gauss-Jordan elimination method to solve

2x-5y+5z=17
x-2y+3z=9
-x+3y=-4

I NEED HELP KNOWING HOW TO USE THIS METHOD

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exam Other Question

I need major help

solve each of the eqautions of x

25x=13

and
2(x-5)^2=3

thanks When using the ramainder theorem and the divosr of the form x + b, what is the value used in f(x) to define the value of the remainder?
a. b
b. 0
c. -b
d. You have to know the value of b first