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For a pair of equations 2x+3y=10 and 3x−y=4, find x.

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-20

-10

answer is A.

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Detailed Solution

2x+3y=10⋯(i)
3x−y=4
y=3x−4⋯(ii)
using (i) & (ii)
2x+3(3x−4)=10
2x+9x−12=10
11x=22
x=2

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