exam Maths Puzzle Numerical Ability

X4 - 16
_________
X - 2

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exam Other Question

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 What is the slope of -2, passing through (4,-1)
Passing through (7,-3) and (5,-2)