At a particular music store, cds are on sale at $14.00 for the first one purchased and $12.00 for each additional disc purchased. maria spends $86.00 on cds. how many cds has maria purchased?

6
7
8
9

7 CDs has been purchased.

Step-by-step explanation:

Given,

For the first CD, cost = $ 14.00,

Let x be the additional number of CD purchased by Maria,

That is, total purchased CD = x + 1,

Now,  for each additional CD, cost = $ 12.00,

So, the cost of x additional CD's = 12x dollars,

And, the total amount of the CDs = (14 + 12x) dollars

According to the question,

Total cost = $ 86.00

⇒ 14 + 12x = 86

⇒ 12x = 86 - 14 = 72

⇒ x = = 6

Hence, the total number of CDs purchased = 6 + 1 = 7.

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x