exam Maths Puzzle Numerical Ability

Find the slope, if it exists, of the line containing the pair of points.

(6,8) and (7,-2)

The slope m= _____

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Thanks again!!!!
Solve by addition. If a unique answer does not exist, state whether it is inconsistent or dependant. McGraw Hill. 6th editon. 8.2. #12.
2x+3y=1
5x+3y=16 -x^2 y^2/ x^1/2 y^0 please help simplify i have no idea how to do this!!