4. Look at the system of equations.
y = 2x - 1
4x + y = 2
Which shows a correct step in using substitution to solve the system of equations?
A. 4x + y = 2x - 1
B. 4x + 2x - 1 = 2
C. 6x - 2 = y.
D. 6x + 2 = 2y
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