Row echelon form in general


how did he get the 6c=18 part, i can solve equation myself but i didnt get that part

The figure is missing an important step - where the ‘a’ variable is eliminated from the third row.

There are two steps.

  • In the left image, multiply the first row by 2 and subtract → replace on the third row. This removes the ‘a’ variable from the 3rd row.
  • Now Multiply the 2nd row by some value and subtract the 3rd row. This removes the ‘b’ variable from the 3rd row.
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