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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Solve for b. b + 6.7 = 19.4

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