book Maths Puzzle Numerical Ability

for I have not done this in a long time and need help on how to work them and little info on them, for I dontwhat they are under ether.

like (6,1) (8,-4) what is the slope of t

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book Other Question

Solve for x in these equations.Verify the solutions.

1/2x=12 an algebra teacher stated that 2x+1=1 5=2x=14 are equivalent. what was done to the first equation to get the second equation? what is the value of x that makes both equations equal?