exam Maths Puzzle Numerical Ability

solve the following system of equations using matrices:

x+y+2=-9
x-y+5z=-19
5x+y+z=29

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exam Other Question

I cannot figure this out - can someone please help.

4sqrt72 - 2sqrt48

Thank you Complete the ordered pairs so that each is a solution for the given equation.
3x+4y=12 (0, ), ( ,3/4), ( ,0), (8/3, )
McGraw Hill 6th edition, chapter 6, section 1, problem # 24. Thanks for your help!!