Substitution Method for Systems of Equations
Which of the following represents a valid first step in solving the given system of equations using the substitution method?
2x - y = 7
x = 2y - 1
A
x = 2(2x - y) - 1
B
2x - y = 2y - 1
C
2x - (2y - 1) = 7
D
2(2y - 1)- y = 7
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