When you use this formula slope = rise/run like rise over run than you find the slope. rise me y and run means x. So when the line slopes downwards to the right it became negative slope as x increases and when line sloped upward to the right the slope become positive as y decreases.
It is a rhombus It is so because all its sides are equalto 10cm. opposite angles are equal. in a parallelogram opposite angles are equal but all sides aren't equal but in case of a rhombus it is so.
