book Maths Puzzle Numerical Ability

Use Gaussian elimination to completely solve:
5x+2y+5z=78
-2x+3y-9z=-53
9x-3y+2z=25

My final answer looks like this:
1 0 0 4
0 0 1 8
0 1 0 9

I've been over and over my

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book Other Question

Which label describes the following? 3x + 6 = 10
A) Linear equation B) Equation which is not linear C) Expression Find the equation of the line passing through the points (-3,8) and (-4,-5)

A) y=13x-47
B) y=13x+47
C) y=13x-31
D) y= -13x-31