exam Maths Puzzle Numerical Ability

Let z be the parameter.
7x + 3y + 5z = 0
3x + y + 2z = 0
PLease Explain!

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Please help to solve :

If one gallon of stain covers 350 square feet, what is the least number of gallons of stain you need to cover the floor of a rectangular deck that is 25 feet long and 16 feet wide? Solve by using the quadratic formula...
1. 2x^2-7x=5
2. x^2+10x+16=0
3. x^2=x+4

Find the axis of symmetry...
1. y=x^2-7x+2

Solve by completing the square..
1. x^2-4x+4=0