Which expression represents an unknown number minus 45?

A.

b * 45

B.

b - 45

C.

b : 45

D.

b + 45

The table can be used to determine the solution of equations, 2x - 2y = 6 and 4x + 4y = 28. A table with 6 columns and 2 rows. The first column, Original System has 2 x minus 2 y equals 6 and 4 x plus 4 y equals 28.

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