3x-4y=1 represents the equation of a line. The solutions for this equation are all the points that lie on the line. Your questions should read something more like: "Given the Equation 3x-4y=1, is (5,8) a solution". The point (5,8) are the x and y values of the equation. Plug em in. If the value on the right side (3x-4y) matches the value on the left side (1), then the point (5,8) is a solution.
