30. ax + bx = c
solve for x

If a || b and e || f , what if the value of y ?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Answer for 10 points show work you guys in advanced < 3