in the coordinate plane , points ( x , 5 ) and ( 9 , y ) are on line k . if line k passes through the origin and has slope 5 / 9 , then x - y =
"line k passes through the origin and has slope 1 / 4 means that its equation is y = 5 / 9 * x . thus : ( x , 5 ) = ( 9 , 5 ) and ( 9 , y ) = ( 9,5 ) - - > x - y = 9 - 5 = 4 . answer : a"
multiply(multiply(9, 9), divide(5, 9))