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The price of a pen and pencil is 8 rupees. the price of 3 pen and pencil is 18 rupees. find the price of a pen and pencil |
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Answer» Answer: the price of pen is ₹5 and pencil is ₹ 3 Step-by-step EXPLANATION: LET the value of pen be x and pencil be y now we are given that x+y=8 3x+y=18 if x+y=8 then, x=8-y SUBSTITUTING the value of x above in 3x+y=18 we get 24-3y+y=18 therefore 24-18=2y by MOVING 18 on left and 2y on right now 6=2y thus y=6/2=3 y=3 substituting the value of y=3 in x+y=8 we get x+3=8 therefore x=8-3 therefore x=5 |
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