book Maths Puzzle Numerical Ability

The question is: Use Elimination to solve:
7x-4y=29
3x+5y=-1

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book Other Question

n -6 ___ X3 ____

Can you please solve this?

(n is in a circle exponent of -6 then another circle exponent of x & it has exponent of 3 then another circle. Thank you in Identify the shape of the graph, transform it into standard form, and sketch the graph.
x^2 - 4y^2 + 4x -24y - 36 = 0