In solving the following system by the substitution method, select the one

step which could occur.

6x + 3y = 33

x - y=1

A. 6 (1 - y) = 33

B. 6 (1 - y) + 3y = 33

C. 6 (1 + y) = 33

D. 6 (1+y) + 3y = 33

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