What to do when the coefficients of either variable are different?

When the coefficients of either variable are different in a system of equations, you can use methods such as substitution or elimination to solve for the variables. If using elimination, you may need to multiply one or both equations by a factor to make the coefficients of one variable the same, allowing you to add or subtract the equations effectively. For substitution, isolate one variable in one equation and substitute it into the other. This will help you find the values of the variables.