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  _____     _____    _    _    __   __    _  __  
 / ____||  |  ___|| | |  | ||  \ \\/ //  | |/ // 
/ //---`'  | ||__   | |/\| ||   \ ` //   | ' //  
\ \\___    | ||__   |  /\  ||    | ||    | . \\  
 \_____||  |_____|| |_// \_||    |_||    |_|\_\\ 
  `----`   `-----`  `-`   `-`    `-`'    `-` --`

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發送短信 : Design of a Mobile App to Promote Understanding and Fluency in Finding the Equation of a Line