exam Maths Puzzle Numerical Ability

Will you help me with substitution?

y=4x
3x-y=1

and

-3x+5y=81
2x+y=24

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exam Other Question

Please help with this problem:
Find all zeros of f: f(x) = 3x^2 + 5x - 2
I believe you use the quadratic formula to solve or do I need to factor? please graph y = 3^x on a grid