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multiply first equation by 3 you get
3 × 2^x + 3 × 3^y =17×3
3 × 2^x + 3^y+1= 51-----(1)
2^x+2 - 3^y+1 = 5
4 × 2^x - 3^y+1 = 5 ----(2)
Adding equation (1) and (2)
(4+3) × 2^x = 51 + 5
7 × 2^x = 56
2^x = 56/7
2^x = 8
2^x = 2^3 {8 can be written as 2^3}
when bases are same compare the powers
therefore, x = 3
put value of X = 3 in equation (2)
4 × 2^3 - 3^y+1 = 5
4 × 8 - 3 × 3^y = 5
32 - 3 × 3^y = 5
-3 × 3^y = 5 - 32
-3 × 3^y = -27
as both sides have negative sign it will become positive
3 × 3^y = 27
3^y = 27/3
3^y = 9
3^y = 3^2
as bases are same so compare the powers
therefore y = 2
venkateshdasari:
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