Among Spainâs indigenous animals are a wide variety of deer, Iberian wild goats, tortoises, bats, snakes, and small reptiles and amphibians.
Solving Systems of Equations by Substitution Method. Substitution is the most elementary of all the methods of solving systems of equations. Substitution method, as the method indicates, involves substituting something into the equations to make them much simpler to solve.
Several algebraic techniques exist to solve simultaneous equations. Perhaps the easiest to comprehend is the substitution method. Take, for instance, our two-variable example problem: In the substitution method, we manipulate one of the equations such that one variable is defined in terms of the other: