You can put this solution on YOUR website!
in order to ELIMINATE one of the variables, you need to get the absolute value of the coefficients to match
__ then you can either add or subtract the equations and the variable will be cancelled (eliminated)
multiplying the second equation by 3 __ 21y-9x=-42
__ adding to first equation __ 9x-9y+21y-9x=36-42 __ 12y=-6 __ y=-1/2
substituting __ 7(-1/2)-3x=-14 __ -3x=-21/2 __ x=7/2