QUESTION IMAGE
Question
graph each equation.
- \\( \frac { x ^ { 2 } } { 4 } + \frac { y ^ { 2 } } { 9 } = 1 \\)
Step1: 确定椭圆的标准形式
椭圆的标准方程为\(\frac{x^{2}}{b^{2}}+\frac{y^{2}}{a^{2}} = 1\)(\(a>b>0\),焦点在\(y\)轴上),对于方程\(\frac{x^{2}}{4}+\frac{y^{2}}{9}=1\),这里\(a^{2}=9\),\(b^{2}=4\)。
Step2: 求椭圆的顶点坐标
由\(a^{2}=9\),得\(a = 3\),\(y\)轴上的顶点坐标为\((0,3)\)和\((0, - 3)\);由\(b^{2}=4\),得\(b = 2\),\(x\)轴上的顶点坐标为\((2,0)\)和\((-2,0)\)。
Step3: 绘制椭圆
根据顶点坐标\((0,3)\),\((0, - 3)\),\((2,0)\),\((-2,0)\),用平滑曲线连接这些点,画出椭圆\(\frac{x^{2}}{4}+\frac{y^{2}}{9}=1\)。
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先确定椭圆顶点\((0,\pm3)\),\((\pm2,0)\),再用平滑曲线连接这些点画出椭圆\(\frac{x^{2}}{4}+\frac{y^{2}}{9}=1\)。