exam Maths Puzzle Numerical Ability

yes i can not figure out how to do this problem please help

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exam Other Question

Evaluate the following. Be sure to use the proper units.
5 lb/ft X 3 ft
Can someone please help me with this problem? I do not even no where to start. 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