Mathematics, 29.10.2019 19:31 marie2061
Seven pens and two pencils costs $6.59. seven pens and five cost $7.55. find the cost of one pencil and the cost of one pen.
Answers: 3
and one pencil as 
, we can produce two equations in terms of 
------> Equation 1
------> Equation 2
and substitute into equation 2, gives
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Seven pens and two pencils costs $6.59. seven pens and five cost $7.55. find the cost of one pencil...
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