Chap 6 Error Analysis Homework 2 Ex 6.2 Q1(l) #2

Go through the working and attempt to identify where the error is.

9 comments:

  1. line 4 : it should be -88 not -85

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  2. 1) -33-45 does not = 85
    2) 9x-78=22x not 22x-78=9x so it should be 9x-22x=-78 which is -13x=-78 not 22x-9x=-85 which is 13x=-85

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  3. Line 4 the number of the right side should be -88

    13x=-88

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  4. The mistake is at Line 4. 13x = -78
    There is a calculation error.

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  5. The mistake is at line 4 . There is a calculation error as , the answer should be 78 .

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  6. The mistake is from line 3 to 4, the mistake is in -33-45=-85 it should be -33-45=-88

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  7. The mistake is in line 3 and the mistake was carried down to line 4. -85 should be -78 as -33 + -45 = -78.

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  8. Line 4 should be 13x = -78.

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  9. It should be -78 instead of -88

    Because -45-33 is -78

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