Definition of Substitution Method. One way to solve systems of equations is by substitution. In this method, solve an equation for one variable, then substitute that solution in the other equation, and solve.
Area code 407 is found in the US state of Florida. Primarily servicing the city of Orlando (population: 921360), area code 407 covers 5 counties of Florida.Located in the Eastern time zone, area code 407 is on the same time as New York, NY. Area code 407 was brought into effect on April 16, 1988.407 was split from the parent 305 area code.rimarily servicing the city of Orlando (population: 921360), area code 407 covers 5 counties of Florida. Located in the Eastern time zone, area code 407 is on the same time as New York, NY.
Alabama has one area code overlay complex in use at this time. Area code 938 was implemented on 7/10/2010 to serve as an overlay of area code 256. Area code 659, which is assigned as an overlay of area code 205, does not yet have an implementation date established.t was at that time that area code 205 was split to form area code 334. After the split area code 205 covered central and western Alabama which included Birmingham and Tuscaloosa while 334 covered southeastern Alabama which included Auburn, Opelika, Montgomery and Selma.