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Published byJeffrey Griffith Modified over 7 years ago

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9.5 Multiplication with the Addition- or-Subtraction Method Purpose: To use multiplication on linear equations before you add or subtract. Homework: p. 432 1-23 odd Review Homework: p. 433 (Mixed) #3,5,9,11,13,23,27 AND p. 434 problems 1-25 odd.

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Solve. 6x + y = 6 ****Notice you can’t eliminate 3x + 2y = 9 a variable. Multiply the bottom equation by -2. 6x + y = 6 -6x + (-4y) = -18 ***NOW ADD. -3y = -12; y = 4; ***Plug in y. 6x + 4 = 6; 6x = 2; x = 1/3 (1/3, 4) is the solution

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Solve 4s – 5t = 3****You need to multiply both 3s + 2t = -15 equations to eliminate. 8s – 10t = 6**Multiplied by 2. 15s + 10t = -75**Multiplied by 5. 23s = -69; s = -3 ***Find t. -9 + 2t = -15; 2t = -6; t = -3 (-3, -3) is the solution.

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