Algebra ( Period 1)

Applying Systems of Linear Equations 6-5

METHOD	BEST TIME to USE
Graphing	estimate solutions
Substitution	If one of the variables has a coefficient of +1 or -1
Elimination Add/Sub	If one of the variables has opposite or same coefficient in both equations
Elimination Multiplication	If none of the coefficients are +1 or -1 & neither of the variables can be eliminated by addition or subtraction

What would the best method? Now find the solution..:

2x + 3y = -11

-8x -5y = 9

Answer: Elim (x)   (2, -5)

3x + 4y = 11

2x + y = -1

Answer: Substitution  ( -3, 5)

3x -4y = -5

-3x + 2y = 3

Answer” Elim (+)  ( -1/3, 1)