in the xy - coordinate system , if ( m , n ) and ( m + 2 , n + k ) are two points on the line perpendicular to x = 2 y + 5 , then k = ?
"the slope = k / 2 the line perpendicular to x = 2 y + 5 or y = 1 / 2 x - 5 / 2 has a slope = - 1 / ( 1 / 2 ) = - 2 - - - > k / 2 = - 2 - - > k = - 4 answer is d"
divide(subtract(add(5, 2), 5), 2)