exam Maths Puzzle Numerical Ability

I hope this is posted in the correct place. I need some help I do not understand how to do this. Thanks for any help you can give.
solve by elimination process and type an ordered pair.
4x - 9y = 14.5
7y - 2x = -8.5

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exam Other Question

answer the question with the given quadratic equation and also sketch and label information on graph .
y = x^2-2x-8
opens: ?
Y-intercept : ?
vertex : ?
Axis of symm: ?
roots:
Could you please help me solve this problem? It is:
4sin2x - sinx = 0