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 code 971 is a Northwestern Oregon area code that covers Portland and its surrounding areas. Area code 971 overlays the area code of 503.Oregon has area codes of 458, 503, 541, 971.rea code 971 is a Northwestern Oregon area code that covers Portland and its surrounding areas. Area code 971 overlays the area code of 503.