book Maths Puzzle Numerical Ability

How do you find the slope and equation of a line when you are just given two points?

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book Other Question

Could you show me how to find the solution to this equation:

A=p=prt when solving for t.

I do not understand how to solve the equation. If you could show me how, I would be
P1= (-1,0); P2= (2,4)