exam Maths Puzzle Numerical Ability

3x+4y=17
6y-2x=-20

Im stuck.

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exam Other Question

This one has driven me crazy too. Please help!!
Evaluate if possible:
3sqrt -64 and 3sqrt64 and sqrt-64 and sqrt64

Thank you
A girl practiced running on her school's field. Her pedometer showed that she ran 300ft in 10seconds, how many minutes would it take for her to complete the mile?