14-4x=2y divide both sides by 2 7-2x=y subsitute 7-2x for y 7-2x+2x=7 add like terms 7=7 true therefor these 2 equations are the same and there are an infinite number of equations
268 gallons are remaining. The equation would be y=324-7x, with x being 8. 7(8) is 56, and then you take away 56 from 324, which then gives you 268 gallons remaining