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.
11 area codes 972 â a geographic split of the 214 area code serving the Dallas region 281 â a geographic split of the 713 area code serving the Houston region: 1997: 15 area codes 254 and 940 â a three-way geographic split of 817 830 and 956 â a three-way split of 210 with San Antonio retaining that area code: 1998: 15 area codes