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7.4 Solve Linear Systems by Multiplying First

7.4 Solve Linear Systems by Multiplying First. Also called Elimination Method Or Linear Combinations Method. Steps to Solve Systems by Elimination. Line up the variables Multiply one equation to eliminate a variable

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7.4 Solve Linear Systems by Multiplying First

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  1. 7.4Solve Linear Systems by Multiplying First Also called Elimination Method Or Linear Combinations Method

  2. Steps to Solve Systems by Elimination Line up the variables Multiply one equation to eliminate a variable Substitute the value into the other equation to solve for the second variable Check to be sure the numbers work in both equations

  3. Solve the system: Lined up – ok Multiply the 1st equation by 3 to eliminate y Use x to find y Check 6x – 3y = 9 4x + 3y = 21 10 x = 30 x = 3 2(3) – y = 3 6 – y = 3 -y = -3 y = 3 • 4(3) + 3(3) = 21 Solution: (3, 3)

  4. Solve the system: Which variable do you want to eliminate?

  5. Solve the system:

  6. Your turn… Solve the system:

  7. Click on the link: http://www.classzone.com/etest/viewTestPractice.htm?testId=4273

  8. Homework: P 454 #3-29 odd(skip 23) 33, 37, 41

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