Question

The cost of 4 pencils, 3 pens and 2 erasers is 60. The cost of 2 pencils, 4 pens and 6 erasers is 90. Whereas the cost of 6 pencils, 2 pens and 3 erasers is *70. Find the cost of each item by using matrix inversion method.​

Answer 1

Answer:

$5 + 5 + 5 + 5 + 10 + 10 + 10 + + 5 + 5 = 60$

1 pencil cost 5

1 pen costs 10

1 eraser cost5

Step-by-step explanation:

pencil and eraser costs same cost

pen cost more than pencil and eraser

then add all amount