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ICSE Class 8 Answered

3x+7y= - 43;7x-2y= - 27
Asked by Cl_narayan | 15 Jan, 2020, 10:09: AM
answered-by-expert Expert Answer
3x+7y= - 43  ... (i)
7x-2y= - 27   ... (ii)
 
Multiply equation (i) by 2 and (ii) by 7, we get
 
6x + 14y = - 86 ...(iii)
49x - 14y = -189 ... (iv)
 
Adding (iii) and (iv), we get
55x = -275 → x = -5
 
Substituting x = -5 in (i), we get
3(-5) + 7y = -43
-15 + 7y = -43
7y = -28 →  y = -4
Answered by Yasmeen Khan | 15 Jan, 2020, 11:13: AM

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