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)
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cost of one pencil=85 cents and one eraser=60 cents
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Answer:
Cost of an Eraser=x=60
Cost of a pencil=25+x=85
Step-by-step explanation:
Pencil
25+x
Eraser
x
8(25+x)+10x=1280. [1 dollars = 100 cents]
[12.80 dollars=1280 cents]
=200+8x+10x=1280
=200+18x=1280
=18x=1280-200
=18x=1080
x=1080÷18
x=60
Cost of an Eraser=x=60
Cost of a pencil=25+x=85
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