Question

बोरिंग ऑफ पेपर एंड बर्निंग ऑफ पेपर और इरिवर्सिबल चेंजेज हाउ आर द डिफरेंट ​

Answer 1

Answer:

Answer:-

\red{\bigstar}★ \large\boxed{\tt\purple{x = 11}}

x=11

\red{\bigstar}★ \large\boxed{\tt\purple{y = 7}}

y=7

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• Given:-

x + y = 18

x - y = 4

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• To Find:-

Value of x and y.

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• Solution:-

✴ \sf x + y = 18 \dashrightarrow\bf\red{[eqn.i]}x+y=18⇢[eqn.i]

✴ \sf x - y = 4 \dashrightarrow\bf\red{[eqn.ii]}x−y=4⇢[eqn.ii]

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• Taking eqn.[i]:-

➪ \sf x + y = 18x+y=18

➪ \sf x = 18 - y \dashrightarrow\bf\red{[eqn.iii]}x=18−y⇢[eqn.iii]

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• Substituting eqn.[iii] in eqn.[ii]:-

➪ \sf x - y = 4x−y=4

➪ \sf (18-y) - y = 4(18−y)−y=4

➪ \sf 18 - y - y = 418−y−y=4

➪ \sf 18 - 2y = 418−2y=4

➪ \sf - 2y = 4 - 18−2y=4−18

➪ \sf - 2y = - 14−2y=−14

➪ \sf y = \dfrac{-14}{-2}y=

−2

−14

★ \large{\bf\pink{y = 7}}y=7

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• Substituting value of y in eqn.[i]:-

➪ \sf x + y = 18x+y=18

➪ \sf x + 7 = 18x+7=18

➪ \sf x = 18 - 7x=18−7

★ \large{\bf\pink{x = 11}}x=11

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Therefore, value of x = 11 and y = 7.