The substitution method involves substituting the value of y from one equation into another. In this case, by solving 9x - 4 = 8x + 6y and finding y, the solution is (x, y) = (1, 5). Here option 2 is correct.
The equation that shows a step that can be used to correctly solve the system of equations is option 2: (9x - 4 = 8x + 6y).
This equation is obtained by substituting the value of (y) from the first equation into the second equation.
This is a common method for solving linear systems of equations, also known as the substitution method.
By solving this equation for (x), we can then find the value of (y) by plugging it back into either equation.
The solution of the system is ((x, y) = (1, 5)). Here option 2 is correct.