Use substitution to solve the system of equations. Which letter choice is the answer?
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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