Sarah went to an electronics store, purchased 3 cds and 5 dvds, and spent $137. michelle went to the same store, bought 2 cds and 7 dvds, and spent $161. how much does each cd sell for at the store? . a) $13 . b)$14 . c)$18 . d) $19 .

b) $14

Step-by-step explanation:

Let x be the cost of each CD and y be the cost of each DVD,

Since, 3 CDs and 5 DVDs cost $ 137,

⇒ 3x + 5y = 137 -------(1),

Also, 2 CDS and 7 DVDs cost $ 161,

⇒ 2x + 7y = 161 --------(2),

7 × equation (1) - 5 × equation (2)   ( ∵ we need the value of x so we have to eliminate y for this LCM(7,5) = 35 )

We get,

21x - 10x = 959 - 805

11x = 154

⇒ x = = 14

Hence, the cost of each CD is $ 14,

Option 'b' is correct.

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent