一次函数图像交点面积问题

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一、解答题（共2题）

1. 已知三个一次函数：$y = x + 2$，$y = -x + 6$，$y = \frac{1}{2}x + 1$。它们的图像两两相交，围成一个三角形。求这个三角形的面积。

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2. 已知三个一次函数：$y = 2x - 3$，$y = -x + 3$，$y = \frac{1}{3}x + \frac{5}{3}$。它们的图像两两相交，围成一个三角形。求这个三角形的面积。

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