Question

A new movie can be downloaded for $8 per movie. An older movie can be downloaded for $3 per movie. Quinn buys a total of 7 movies and spends $41.

A. define your variables. Write the system of equations and represent it as a matrix equation.

b. use matrices to solve the equation by hand

Answer 1

Working to solve the problem $8 = x and $3 = y
Is this the correct way to start

Answer 2

well, pretty close

Answer 3

technically not the correct notation but i think your idea is correct

Answer 4

oh okay.. so what notation should i be using.. i get them confused

Answer 5

I want to work it the correct way

Answer 6

actually nvm that it's correct after all

Answer 7

so you're using x for new movies and y for old movies

Answer 8

okay so that is the number vs the movie?

Answer 9

what do you know about the relation between x and y?

Answer 10

yes that is correct. I am using x for new movies and y for old movies

Answer 11

nothing really except that a total of 7 movies were bought so I know some of them or at least 1 had to be old or new

Answer 12

well actually i would not call that nothing.

You know the total number of movies is exactly 7, so, do you agree with me that with that logic x+y=7?

Answer 13

yes I do agree

Answer 14

I actually have it written down that way next on my paper but after that i just go blank

Answer 15

After that I started trying to work on the matrices but that part isn't making sense to me

Answer 16

actually i believe the notation is not correct by the way, because x represents the AMOUNT of movies and not the VALUE of the movies. and the same counts for y.

Answer 17

so
x = number of new movies
y = number of old movies

Answer 18

no numerical value assigned yet

Answer 19

okay gotcha