2025年8月美国A卷 · 第 15 题

Line \( p \) is defined by \( kx+7y=16. \) Line p passes through the points \( (r,\ 0) \) and \( (0,\ t) \) in the xy-plane, where \( k \), \( r \), and \( t \) are nonzero constants and \( r \) is not equal to \( t \). Which expression represents the value of \( k \)?