In the coordinate plane, points (x, 1) and (5, y) are on line k. If line k passes through the origin and has slope 1/5, then what are the values of x and y respectively?  Choose the correct choice from the following answers.
A) 4 and 1
B) 1 and 5
C) 5 and 1
D) 3 and 5
E) 5 and 3

Rationale: "line k passes through the origin and has slope 1 / 5 means that its equation is y = 1 / 5 * x . thus : ( x , 1 ) = ( 5 , 1 ) and ( 5 , y ) = ( 5,1 ) - - > x = 5 and y = 1 answer : c"
Answer: C