exam Maths Puzzle Numerical Ability

Convert the system of equations into a matrix equation.

x+4y-z=7
x+y+z=2
-2x-2y+2z=-8

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exam Other Question

solve, being sure to reject any value of x that produces the logarithm of a negative number or the logarithm of zero in the original equation in x=-4 trying to help my son...everyone in the house has worked and we get different answers. Please help us to understand! Gets confusing w/all the fractions...
c/2 - d/5 = -4;2c/3 -3d/5 = -7

thank you!