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 is currently using five area codes. Area code 205 originally covered all of Alabama when it was established in 1947.It was not until 1995 that Alabama experienced sufficient growth in population and telephone use to need an additional area code.It 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.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.