Solve the given system by elimination: 2) 4x + 2y = -2 2x – y = -3

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Presentation transcript:

Solve the given system by elimination: 2) 4x + 2y = -2 2x – y = -3 Warm up Solve the given system by substitution: y = 2x + 2 4x – y = -6 Solve the given system by elimination: 2) 4x + 2y = -2 2x – y = -3

Questions over hw?

SUBSTITUTION ELIMINATION GRAPHING Summary of Methods Substitution: one of the variables be isolated on one side of the equation or easy to isolate when one of the variables has a coefficient of 1 or -1. Elimination: a variable appears in different equations with coefficients that are opposites or each variable has a coefficient. Graphing: when the equations are in y = mx+b, or y can easily be solved for with a whole number as the y-intercept. SUBSTITUTION ELIMINATION GRAPHING

White Board Review

Graphing

Substitution

Elimination

Best Method 7. y = 4x – 3 5x – 2y = 6 8. 4x – 5y = 13 2x + 5y = 5

Best Method

Best Method 12. x + y = 4 2x + 3y = 7

Homework Quiz on Friday! Quiz Review