Use substitution to solve the system of equations.

y = 4.5x + 7.5

y = - 3.5x - 4.5

A. x = - 1.5, y = - 0.75

B. x = 1.5, y = 0.75

C. x = 1.5, y = - 0.75

D. x = - 1.5, y = 0.75

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