2. 外语
  3. Solve for y if the distance between the two points(2,8)and(-6,y)is 17.

Solve for y if the distance between the two points(2,8)and(-6,y)is 17.

admin2013-02-19  35
问题 Solve for y if the distance between the two points(2,8)and(-6,y)is 17.
选项
答案23
解析 Use the Distance Formula to solve this problem. Because you are given the distance between the points, your equation will look like this:
17 =
Square both sides and solve for y2:
289 =(-8)2 +(y2 - 8)2
289 =(64)+(y2 - 8)2
225 =(y2 - 8)2
15 = y2 - 8
23=y2
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