Clearing a Column, or "Pivoting"
(1) Next to the row you want to change, write the name of row you need to change on the left, and the pivot row on the right.
(2) Ignoring signs, decide what positive whole number to multiply each row by so that the row you want to change and the pivot row have the same numerical values in the pivot column. In the situation at hand, the pivot column is
so you can accomplish this by multiplying the first row by 5 and the second by 4. Doing so gives the partial row instruction.
(3) If the two entries in the pivot column have the same sign, insert a minus (), but if they have different signs, insert a plus (+).
This is the instruction we used.
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