franciscatutuwaa82 franciscatutuwaa82

12-06-2022
Mathematics

contestada

14. 9 pens and five pencils cost $3.20
and 7 pens and 8 pencils cost $2.90.
Find the unit price for each pen and
pencil.

Respuesta :

melancholy1644 melancholy1644

12-06-2022

Answer: scroll down to find out :)

Step-by-step explanation:

Let's say pens are p and pencils are e.

9p + 5e = 3.20

7p + 8e = 2.90

2p - 3e = 0.30

p = (0.3 + 3e)/2

7(0.3 + 3e/2) + 8e = 2.90

(2.1 + 21e)/2 + 8e = 2.9

e = 0.1, p = 0.3

So, pencils are 10 cents and pens are 30.

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