A). The second one and the fourth one combined make the object ( a )
B). First one and the last one combined make the object ( b )
C). First one and the third one combined make the object ( c )
The answer is the second one
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Answer:
2 Answers By Expert Tutors ... Let's set x = cost of books and y = cost of pens. ... In algebra, this can be written as x + y = 18. ... Using x and y, we get 1 book and 2 pens costs $21, or x + 2y = 21 ... The pen must cost $3 because we are adding $3 to the total when we ... Please provide a valid phone number.
Step-by-step explanation:
