The matrix method is being used to solve the system of equations x + 2y = 4 and 3x - y = 6.
If the goal of the first matrix operation is to get a zero in row 2, column 1, then one could
a) subtract 3 from each entry of row 2
b) multiply row 1 by - 3 and add the result to row 2
c) divide row 2 by - 3 and add to row 1
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