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ZX-C8DBEDA6A9Systems of two linear equations in two variables · 第 14 题
Systems of two linear equations in two variables · 原库模块 1 · Q14 原库参考解析
8x + 7y =9
24x + 21y =27
For each real number r , which of the following points lies on the graph of each equation in the xy-plane for the given system?
参考答案：
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