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

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

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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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