Use linear combination to solve this. It is much faster than substitution. I would start by multiplying the bottom equation by -1. <span>4x-7y=3 -x+7y=15</span> Then, add the two equations together. The result is: 3x=18. You've eliminated one variable. Now you can solve for the other one. Divide both sides by 3 to get x=6 Plug this into one of the original equations, then solve for y -(6)+7y=15 7y=21 y=3
Check your work by plugging these values into both equations to see if they remain true
