3x+2y=12 , 2x+y=7 by substitution method std 10
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2x + y = 7
y = 7 - 2x ..................(1)
substitute y in 3x + 2y = 12
3x + 2 (7-2x) = 12
3x + 14 -4x = 12
-x = 12 - 14
x = 2
substitute x in (1)
y = 7 - 4
y = 3
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