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ICSE Class 9 Answered

5x+7y=66 2x-3y=-20
Asked by natashagupta50.9spicertl | 29 May, 2020, 06:50: PM
answered-by-expert Expert Answer
5x + 7y=66  .... (i)
2x - 3y=-20  .... (ii)
 
Multiply (i) by 3 and (ii) by 7, we get
 
15x + 21y =198  ... (iii)
14x -  21y = -140 ... (iv)
 
Adding (iii) and (iv), we get
 
29x = 58
→ x = 2
 
From (ii),
3y = 2(2) + 20
→ 3y = 24
→   y = 8
 
The solution of the given simultaneous linear equations is x = 2 and y = 8.

 

Answered by Yasmeen Khan | 29 May, 2020, 07:02: PM

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