exam Maths Puzzle Numerical Ability

Find the axis of symmetry.
Y=x^2 + 5x -9

I am not understanding how to find the axis of symmetry and would like some help with this to understand this better. Thanks.

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exam Other Question

What part of the general slope-intercept equation represents the slope?

What part of the general slope-intercept equation represents the y-intercept?

Define the y-intercept.

Define the x-intercept. Well, I'm really not doing just average I am doing weighted averages and I need some help or give me some examples and maybe I can go from their.