math,question

okay i really don't understand this problem.
It says:

Prove the point-slope equation property which is :

Point-slope equation(an nonvertical line with slope m and containing a point (X1,Y1) has the point-slope equation of y-y1=m(x-x1).

Now show that any point (x2,y2) on the line described must satisfy the equation, and that any point satisfying the equation must be on the line described.

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