If 3x + 4y = 7 and 10x - y = 9. then und value of 4x + 6y.
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3x + 4y = 7
so x = 1 or y = 1
10x - y = 9
so x = 1 or y = 1
then 4x + 6 y = 10
because x = y =1
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