Question

A manager purchased a total of 21 coffee mugs and key chains. Each coffee mug cost $8.50, and each key chain cost $2.75. If the manager spent a total of $132.50, how many coffee mugs did the manager purchase?

Answer 1

x=13

Step-by-step explanation:

x+y=21

8.5x+2.75y=132.50

8.5x+2.75(-x+21)+132.50

8.5x-2.75x+57.75=132.50

5.75x=74.75

x=13

Answer 2

ow, subtract this one from second equation,

5.75x = 74.75 Answer:

Then, x + y = 21

& 8.50x + 2.75y = 132.50

2.75x + 2.75y = 57.75

x = 74.75 / 5.75

x = 13

Step-by-step explanation:

Da answer equals 13