Given that $x+y = 7$ and $3x+y = 45,$ evaluate $x^2-y^2.$
Question:
Given that $x+y = 7$ and $3x+y = 45,$ evaluate $x^2-y^2.$
Answer:
Let's think step by step.

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Given that $x+y = 7$ and $3x+y = 45,$ evaluate $x^2-y^2.$
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