Which of the following equations represent this statement ' The cost of the notebook (x) is thrice the cost of a pen(y).'
(a) 3x-y=0
(b) x-3y=0
(c) 3x+y=0
(d) x+3y=0
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Answer:
(d) x+3y=0
Step-by-step explanation:
notebook's cost = x
pen's cost= y
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