You can put this solution on YOUR website! When both equations are given to you in the form Ax+By=C, by far the easiest way to solve the system of equations is by eliminating one of the variables.
You are given
Since the y terms have coefficients that are opposite signs, my preference is to multiply one or both equations by appropriate constants so that the coefficients of y in the two equations are opposites; then adding the two equations will eliminate y, leaving an equation in just x that I can solve. Then I use that value of x in one of the original equations to solve for y.
[multiply the first equation by 3] [add the two equations] [set x to -1 in the second equation]
