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Julie Jam

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The price of admission for a concert was $9 for adults and $4 for children. Altogether, 1770 tickets were sold, and the
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A. 3x + y = 8x-y =6 B. x- 1/2y =2 y=2x-4 C. x + 2y = 9 2y = -x + 13 I am not grasping the substitution method! Please help me.
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