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.
Presently, 830 completely surrounds 210. Geographically, the area code covers the north-western portions of South Texas, including parts of the Texas Hill Country.t was created July 7, 1997, in a split from area code 210, which was retained by most of San Antonio, with a few outer portions of the city moving to 830.