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State whether the following equations are independent, dependent, consistent,...

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spock3 | Student, Undergraduate | Honors

Posted May 10, 2012 at 6:27 AM via web

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State whether the following equations are independent, dependent, consistent, inconsistent: 4x + 8y = 2 and x + 2y = 1/2

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted May 10, 2012 at 3:02 PM (Answer #1)

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The equations given are: 4x + 8y = 2 and x + 2y = 1/2.

Plotting the lines represented by the two equations gives:

Both the equations give the same line. The equations have an infinite number of solutions.

The equations that are given are consistent but dependent.

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baronridiculous | College Teacher | eNoter

Posted May 10, 2012 at 6:58 AM (Answer #2)

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Notice that the first equation is exactly the second equation multiplied by 4 on both sides.  So this system is dependent.

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