book Maths Puzzle Numerical Ability

Solve the system
3x+2y=12
2y-5z=1
x+y+z=6

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book Other Question

peter wanted to draw a line parallel to the line of a window with equation y = x + 2.if the line is supposed to pass through point (2,3).what is the equation of the line desired by peter? fing the roots of the equestion:x^2+4x+8?
1.fing the roots by using compliting the squar method?
2.fing the roots by using factorisation method?
3.fing the roots by usin graphic