Question 174329
you mean how do you tell if a  point is a solution to a given or derived equation.  Plug it in and see if it makes the equation a true statement. If it does it is a solution on the graph of that equation
:example y=2x-3.....point (1,-1)
:
plug that point in
-1=2(1)-3
-1=-1    therefore this point is on the graph of y=2x-3
:
{{{graph(300,300,-10,10,-10,10,2x-3)}}}