Substitution: To use substitution you most isolate one variable and then substitute your answer for a variable in the second equation. Then using the answer you received from the second equation, plug it into the first equation and solve for both variables.
Elimination: In the elimination method you either add or subtract the equations to get an equation in one variable. When the coefficients of one variable are opposites you add the equations to eliminate a variable and when the coefficients of one variable are equal you subtract the equations to eliminate a variable.If you don't have equations where you can eliminate a variable by addition or subtraction directly you can begin by multiplying one or both of the equations with a constant to obtain an equivalent linear system where you can eliminate one of the variables by addition or subtraction.
Graphing: To solve a system of equations graphically, graph both equations and see where they intersect. The intersection point is the solution (it's easiest to do when the equations are in slope intercept form or you use a graphing calculator.
When bound by paper and pencil I prefer to use elimination to solve equations considering the amount of ease it is to solve equations with this method. Although, when able to to use something such as a computer I like to graph as the computer does must of the heavy lifting.
Elimination: In the elimination method you either add or subtract the equations to get an equation in one variable. When the coefficients of one variable are opposites you add the equations to eliminate a variable and when the coefficients of one variable are equal you subtract the equations to eliminate a variable.If you don't have equations where you can eliminate a variable by addition or subtraction directly you can begin by multiplying one or both of the equations with a constant to obtain an equivalent linear system where you can eliminate one of the variables by addition or subtraction.
Graphing: To solve a system of equations graphically, graph both equations and see where they intersect. The intersection point is the solution (it's easiest to do when the equations are in slope intercept form or you use a graphing calculator.
When bound by paper and pencil I prefer to use elimination to solve equations considering the amount of ease it is to solve equations with this method. Although, when able to to use something such as a computer I like to graph as the computer does must of the heavy lifting.