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ICSE Class 9 Answered

7x-2y=20,11x+15y+23=0  
Asked by ruchikamalik0202 | 20 Sep, 2019, 10:45: AM
answered-by-expert Expert Answer
7x-2y=20          .... (1)
11x+15y = -23  .... (2)
Multiply equation (1) by 15 and (2) by 2, we get
105x - 30y = 300   ... (3)
22x  + 30y = -46   ... (4)
Adding (3) and (4), we get
127x = 254
→   x = 2
Substitute the value of x = 2 in (1), we get
7(2)-2y=20
→ 2y = -6
→   y = -3
 
Therefore x = 2 and y = -3.
Answered by Yasmeen Khan | 20 Sep, 2019, 11:37: AM
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