exam Maths Puzzle Numerical Ability

solve this system of equations. if it is unsolvable say so.
3x + 4y + 5z=8
1x - 2y + 3z= -6
2x - 4y + 6z=8

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exam Other Question

Simplify the following:
a) (x+1)/(x-2) + (x-3)/(2x+10)
b) (x^2+2x-3)/(x^2+x-2) - (x^2+x-2)/(x^2+7x+10) the resistance of an electric wire is directly proportional to the length of the wire and inversely proportional to the square of the diameter. Write a formula expressing this property using R for resistance, L for length, and D for diameter.