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请教NN们一个数学的表达式
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做Kaplan时遇到的一个题目，被饶混了，NN们帮偶看一下。
If on a coordinate plane, point A has the coordinates (-3,4), how far is point A from point E?
1. point E is on the Y-axis, four units from the orgin
2. if point A were twice as far from point E, it would be the same distance from point E as point C is at coordinates (0,2)
答案C到很简单，偶只是不知道条件中，A，E，C点之间的具体关系式是怎样的？
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