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.
The state of Alabama is served by five area codes. When the first area code plan was introduced in 1947, area code 205 covered the entire state.In 1995, 334 was created for the southern half of the state. 205 was divided further in 1998, when north and eastern Alabama were placed under 256.The southwestern part of the state was split from 334 in 2001, forming area code 251. A fifth area code, 938, overlays 256 as of July 2010.05 was divided further in 1998, when north and eastern Alabama were placed under 256. The southwestern part of the state was split from 334 in 2001, forming area code 251. A fifth area code, 938, overlays 256 as of July 2010.