8.4 Elimination using Multiplication To solve systems by elimination with a Multiplication twist.

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Presentation transcript:

8.4 Elimination using Multiplication To solve systems by elimination with a Multiplication twist

Steps: 1. decide which variable to eliminate 2. make coefficients the same by using mult. 3. Solve just like the previous problems

2x + 3y = 5 5x + 4y = 16 4[ ] 3[ ] 8x + 12y = 20 15x + 12y = 48 (-) -7x = -28 x = 4 2(4) + 3y = y = 5 3y = -3 y = -1 (4, -1)

4x + 3y = 8 3x - 5y = -23 [ ] 5 [ ]3 20x + 15y = 40 9x - 15y = x = -29 x = -1 4(-1) + 3y = y = 8 3y = 12 y = 4 (-1,4)