Last week, an online site received $355.60 for selling 20 cell phone accessories Cell phone cases sell for $10.98 and Airpods sell for $27.98. 1. Define the variables.
2. Then, write the system of equations to model this situation.

i. Cell phone cases

  Airpods

ii. x + y = 20 .............. 1

10.98x + 27.98y = 355.60 .............. 2

iii. x = 12, and y = 8

Step-by-step explanation:

Amount of sale = $355.60

Cost of Cell phone cases = $10.98

Cost of Airpods = $27.98

Number of phone accessories sold = 20

1. The variables to be considered in the question are:

i. Cell phone cases

ii. Airpods

2. Let the number of cell phone cases bought be represented by x, and that of airpods be represented by y.

Thus,

x + y = 20 .............. 1

10.98x + 27.98y = 355.60 .............. 2

From equation 1,

x = 20 -y

substitute the value of x in equation 2

10.98(20 - y) + 27.98y = 355.60

219.6 -10.98y + 27.98y = 355.60

17y = 136.60

y =

y = 8.0353

So that,

x = 20 -y

  = 20 - 8.0353

x = 11.9647

Thus,

x = 12, and y = 8

Multiply 25 by 787 to get 19675. Then add the number of decimal places in the factors to find the number of decimal places in the answer. There are 19.675 grams of fat in 2.5 cups of corn. Estimate to check the answer using 3 x 8 to get 24.

hope this helped