exam Maths Puzzle Numerical Ability

Find x:y:z, if 2x+y-5z = 0 and 3x-2y-4z=0
a)1:2:1 b)1:1:1 c)1:1:2 d)2:1:1

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exam Other Question

Pivot on the appropriate entry to find the nex tableau

[ 2 1 2 1 0 0 0 : 330]
[ 1 2 2 0 1 0 0 : 330]
[-2 -2 1 0 0 1 0 : 132] Solve the system by substitution

x+y=12
y=2x

y=12+x

Need to solve and graph, the second equation is confusing as to how it fits into the first equation.