exam Maths Puzzle Numerical Ability

what is the solution to- 9x-3y=3
3X+8Y=-17

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exam Other Question

Solve 3x^2 - 7x - 13 = 0.

And, then find the x-intercepts of f(x) = 3x^2 - 7x - 13

Thank you.
what is the answer for 6 to the 3rd power