4. Use the coordinate plane to draw a line that passes through point $$ W $$ at $$ (7,0) $$ and point $$ X $$ at $$ (1,9) $$. Label each point. What is the distance between points $$ W $$ and $$ X $$ ?

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在坐标平面上绘制一条通过点 $$ W(7,0) $$ 和点 $$ X(1,9) $$ 的直线，并标记每个点。
使用距离公式计算点 $$ W $$ 和点 $$ X $$ 之间的距离。距离公式为：  
$$ d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} $$  
其中 $$ (x_1, y_1) = (7, 0) $$ 和 $$ (x_2, y_2) = (1, 9) $$。
Calculate the value by following steps:
- step0: Calculate:
  $$\sqrt{\left(1-7\right)^{2}+\left(9-0\right)^{2}}$$
- step1: Subtract the numbers:
  $$\sqrt{\left(-6\right)^{2}+\left(9-0\right)^{2}}$$
- step2: Remove 0:
  $$\sqrt{\left(-6\right)^{2}+9^{2}}$$
- step3: Add the numbers:
  $$\sqrt{117}$$
- step4: Write as a product:
  $$\sqrt{9\times 13}$$
- step5: Write in exponential form:
  $$\sqrt{3^{2}\times 13}$$
- step6: Use the properties of radicals:
  $$\sqrt{3^{2}}\times \sqrt{13}$$
- step7: Simplify the root:
  $$3\sqrt{13}$$
点 $$ W $$ 和点 $$ X $$ 之间的距离为 $$ 3\sqrt{13} $$。

Use the coordinate plane to draw a line that passes through point at
and point at . Label each point. What is the distance between points
and ?

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