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.
please explain by using Cramer's Rule only.
Answers
Answered by
1
Answer:
p=e+.25 8p+10e=12.80
Answered by
0
Answer:
let the cost of the eraser be x and the pencil be x + .25
according to the question
8( x + .25 ) + 10x = 12.80
8x + 2 + 10x = 12.80
8x + 10x + 2 = 12.80
18x + 2 = 12.80
18x = 12.80 - 2
18x = 10.80
x = .60
so, the cost of the eraser is x = .60 cents
the cost of the pencil is x + .25 = .60 + .25 = .85 cents
Step-by-step explanation:
sorry i don't know the cramer's rule
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