Substitute the coordinates of the point into the equation and if the result is a true statement then the point is a solution, and if not it isn't.
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If the two equations are linear transformations of one another they have the same solution.
extraneous solution. or the lines do not intersect. There is no common point (solution) for the system of equation.
The local solution of an ordinary differential equation (ODE) is the solution you get at a specific point of the function involved in the differential equation. One can Taylor expand the function at this point, turning non-linear ODEs into linear ones, if needed, to find the behavior of the solution around that one specific point. Of course, a local solution tells you very little about the ODE's global solution, but sometimes you don't want to know that anyways.
Is (7, 9) a solution to the equation y = x?
Depends on the type of math problem. there's usually an equation to see if there is a solution or not.