If 217x + 131y = 913, 131x + 217y = 827, then x + y is
(a) 5 (b) 6 (c) 7 (d) 8
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Last updated at Sept. 6, 2021 by Teachoo
Transcript
Question 24 If 217๐ฅ + 131๐ฆ = 913, 131๐ฅ + 217๐ฆ = 827, then ๐ฅ + ๐ฆ is (a) 5 (b) 6 (c) 7 (d) 8Given equations 217๐ฅ + 131๐ฆ = 913 โฆ(1) 131๐ฅ + 217๐ฆ = 827 โฆ(2) Adding both equations (1) and (2) (217๐ + 131๐) + (131๐ + 217๐) = 913 + 827 (217๐ฅ + 131๐ฅ) + (131๐ฆ + 217๐ฆ) = 1740 348๐ฅ + 348๐ฆ = 1740 348 (๐ + ๐) = 1740 ๐ฅ + ๐ฆ = 1740/348 ๐ฅ + ๐ฆ = 5 So, the correct answer is (a)
CBSE Class 10 Sample Paper for 2022 Boards - Maths Standard [MCQ]
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CBSE Class 10 Sample Paper for 2022 Boards - Maths Standard [MCQ]
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