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ICSE Class 9 Answered

Q9. 13x + 11y = 70 11x + 13y = 74
Asked by Swatisasturkar | 04 Feb, 2023, 01:27: PM
answered-by-expert Expert Answer
13 x + 11 y = 70  . . . . . . . . . . . . . . (1)
 
11 x + 13 y = 74 . . . . . . . . . . . . . . (2)
 
Multiply eqn.(1) by 11 ,  143 x + 121 y = 770 . . . . . . . . . . . . . . . (3)
 
Multiply eqn.(2) by 13 ,  143 x + 169 y = 962 . . . . . . . . . . . . . .  .(4)
 
subbtracting eqn.(3) from eqn.(4) , we get
 
48 y = 192  or   y = 4
 
by substituting y = 4 in eqn.(1) , we get 13 x = 70 -44 = 26
 
x = 2
 
Answer :- x =2 , y = 4
Answered by Thiyagarajan K | 04 Feb, 2023, 03:02: PM
ICSE 9 - Maths
Asked by Swatisasturkar | 04 Feb, 2023, 01:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Maths
Asked by aroragayatri2006 | 11 Sep, 2020, 11:25: AM
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