The method described by Mark is excellent but there are many ways to solve "systems of equations". For example, instead of solving the *first* equation for y (in terms of x) and putting that into the second equation, you could solve the *second* equation for y (in terms of x) and put that into the first equation. Or solve either equation for x (in terms or y) and put that into the other equation. The basic idea is to reduce from "two equations in two unknowns" to "one equation in one unknowm". What I might do is, observing that the first equation has "4x" and the second equation "3x" is multiply the first equation by 3, to get 12x+ 9y= 186.81, and multiply the second equation by 4, to get 12x+ 16y= 248.76. Since I now have "12x" in both equations, subtracting the first from the second "eliminates" x giving the single equation in y, 7y= 248.76- 186.81= 61.95 so that y= 61.95/7.