A. What does the equation x=4 represent in R2? Whatdoes it represent in R3? Illustrate with sketches.

b. What does the equation y=3 represent in R3? Whatdoes z=5 represent? What does the pair of equations y=3 and z=5? Inother words, describe the set of points (x, y,z) such that y=3 andz=5. Illustrate with a sketch.

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.