exam Maths Puzzle Numerical Ability

Help I cannot get this :)
Find values for m and b in the following system so that the solution to the system
is (3, 4).
5x+7y=b
mx+y=22

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I would greatly appreciate if someone could show me how to answer these problems. Thanks
-troubled student

*A boy can row a boat at a constant rate of 5 mi/hr in still water. graph the inequality

y-2x<2