15+(10-x)=15 would be your equation if that is what you are looking for.
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I think the option B suits the most
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if this is a fraction, then negative 5 over a⁶
#2 #3 and #5 I think but I could be wrong. Good luck!
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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.
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