book Maths Puzzle Numerical Ability

Find the axis of symetry (X-coordinate) and vertex of the parabola y = 6 + 6x - 1/3xSQUARED. the x of 1/3x is squared

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Please help me (and explain the breakdown steps alon the way please)solve this (The chart may not come through, so I'll do my best to explain it. Thank you.

Tiger Woods rallied Solve the following system by using either addition or substitution. If a unique solution
does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3