Presentation on theme: "Section 3: solving Systems of Equations with combinations/elimination."— Presentation transcript:
Section 3: solving Systems of Equations with combinations/elimination
Review When is it easiest to solve a system of equations using the graphing method? When is it easiest to solve a system of equations using the substitution method?
Solve the System by Graphing y = 5x – 4 y = 2x - 1
Solve the System using Substitution x = 2y + 3 -4x + 5y = 6
Elimination/Combination Elimination/Combination is best used when both equations in the system are in standard form (Ax + By = C) This method combines both equations by adding or subtracting them together, but one of the variables must be eliminated as soon as the equations are combined.
Ex 1: Solve using Elimination/Combinations 4x – 2y = 7 x + 2y = 3 * are the equations in standard form?
Elimination/Combination – part 2 Review: Solve the system. 2x – 3y = 10 4x + 3y = 8