exam Maths Puzzle Numerical Ability

Can you please help me find the slope of hte equation 6x-5y=30.

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exam Other Question

Rationalize the denominator:

5/sqrt[3]+sqrt[5] -3r+5-3s-7+8s-2t-r i dont need the answer, i just need to know how to do this kind of a problem...answer is optional. please help me do this!!!