book Maths Puzzle Numerical Ability

Solve the following simultaneous equation:

r^2 + s - 7 = 0; r - s = 5

Please show any working out and thank you in advance for your help

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book Other Question

12y+3-9=12y-36 cant figure out how to do this kind of problem can you help A fisherman takes his boat out to sea and then back to the harbor. The entire trip lasts 8 hours. If he travels out at 18 mph and follows the same route back at 14 mph, how many miles does he travel altogether?