Question

The cost of a pencil is 25 cents more than the cost of a eraser. If the cost of 8 pencils and 10 erasers is

$12.80, find the cost of each.(Use Cramer’s Rule)​

Answer 1

Answer:

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Answer 2

Answer:

Let Eraser Cost= x

By the Given Problem Pencil cost = 25 + x

Therefore Cost of 8 Pencils = 8(25+x)

= 200+8x

Therfore cost of 10 erasers = 10(x)

=10x

$12.80 = 1280 Cents

Therefore 200+8x+10x =200+18x

200+18x = 1280 cents

18x=1280-200

18x=1080

x=1080/18

x=60

pencil cost = 25+x

=25+60 [Substitute X=60]

=85 CENTS

ERASER COST = x

Therefore x=60

Pecil cost=85 cents

eraser cost=60 cents