A way to solve a linear system algebraically is to use the substitution method. The substitution method functions by substituting the one y-value with the other. We're going to explain this by using an example. We can substitute y in the second equation with the first equation since y = y.
Area code 970 is an area code serving most of the western and northern parts of Colorado.It covers Aspen, Vail, Durango, Grand Junction, Fort Collins, and Estes Park.rea code 970 is an area code serving most of the western and northern parts of Colorado.
Area codes 704 and 980 cover Charlotte and all or part of 12 surrounding counties in south-central North Carolina. Other major cities in the service area are Gastonia, Kannapolis, Concord, Mooresville, Salisbury and Statesville. The South Carolina side of the Charlotte metropolitan area is part of area code 803.The main area code, 704, is one of the original 86 Numbering Plan Areas assigned in 1947. At that time it covered the entire state of North Carolina.n 1998, most of the western portion of the old 704 territory, including the Foothills and Blue Ridge, were split off to create area code 828, leaving 704 to cover the Charlotte area. Within two years, however, 704 was close to exhaustion once again due to the proliferation of cell phones and pagers.