3x+4y=5 x-6y=9 by elimination
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3x+4y=5
x-6y=9....×3
3x-18y=27
3x+4y=5
-. -. -
-22y=22
=> y= 22/-22= -1
putting the value of y= -1 in the 1st equation
3x+4(-1)=5
=> 3x-4=5
=> 3x=5+4=9
=> x=9/3=3
so, x=3
y= -1
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