If (5, 2) is a solution of the equation, then when you substitute 5 for x in the equation and 2 for y in the equation, you should get a true statement.
For instance (3, 2) is not a solution because
3 + 7(2) does not = 9
In your problem, does, 5 + 7(2) = 9?
9/18/2013

Lynne R.