Question

Eric purchased three music CDs and a sweatshirt from a band's online store and received a 20% discount. He paid $100 for his purchase. The following week, the same store offered a 40% discount on all its products. Eric's friend Neil took advantage of the sale and bought four music CDs and two sweatshirts for $120

Assuming that the actual prices of the music CDs and the sweatshirts are unchanged, the price of a music CD is $
a. 20
b. 25
c. 30
d. 50
and the price of a sweatshirt is $
a. 20
b. 25
c. 30
d. 50

Answer 1

anybody?

Answer 2

It's A for both.
Can you fan and medal if correct?

Answer 3

u sure ?jeje @ciara9271

Answer 4

one sec ill recheck

Answer 5

eh let x be the price for one cd and y the price for a sweatshirt
so Eric paid (3x+y)-0.2(3x+y)=100
the same thing with Neil
(4x+2y)-0.4(4x+2y)=120

Answer 6

solve the system

Answer 7

A&B

Answer 8

well there are other ways to think about this!

Answer 9

so i subtitute the x and y to se if true?

Answer 10

realize that if the price of the cds or sweatshirt changed when Neil made his purchase
this equations would make any sense

Answer 11

How do you solve a system of equations?
there are many methods

Answer 12

working on it jeje ...

Answer 13

Good luck, make sure you do it correctly

Answer 14

i dont know i give up -_-...i am not really good at this

Answer 15

@xapproachesinfinity

Answer 16

hehe you can't solve a system of two equations?
2.4x+0.8y=100
and
2.4x+1.2y=120

Answer 17

so it woulbe x=25 and y=50 i guess?

Answer 18

its hard :P lol

Answer 19

B & D

Answer 20

just subtract first equation from second
you 1.2y-0.8y=20
0.4y=20 ===>y=50
then x=25

Answer 21

you got that right

Answer 22

yes B and D

Answer 23

is hard the part you have to set up the equation but once u have the equation is easier..but Thakn u so much

Answer 24

You are welcome!
eh it is not actually hard, this something you do in your everyday life