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

Please show me the steps to solve this.

graph the region decribed by the inequality

-4>=2y

Thanks so much The cell phone manufacturer Nokia net sales for various years are listed in the table below

YEAR Net Sales (Billions of Dollars)
1991 4.0