简答题：(本小题满分13分) 弹簧的伸长与下面所挂砝码的重量成正比，已知弹簧挂20g重的砝码时长度是12cm，挂 35g重的砝码

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题目内容：
(本小题满分13分)
弹簧的伸长与下面所挂砝码的重量成正比，已知弹簧挂20g重的砝码时长度是12cm，挂
35g重的砝码时长度是15cm，写出弹簧长度y(cm)与砝码重x(g)的函数关系式，并求弹簧
不挂砝码时的长度．
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