All you have to do to solve this equation is plug the equation you have that already is manipulated for y. Y=2X+3 and substitute it into the equation for y in the first equation, 2x-y=7. So it becomes 2x-(2x+3)=7. By distributing the - sign into the brackets we get 2x-2x-3=7. 0-3=7. -3 does not equal 7. Thus I would think the answer is no solution.
(50 ) mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.