How do you solve -2x-9y=-25 and -4x-9y=-23?
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-2x-9y=-25
=> 2x+9y= 25 ------------------(1)
-4x-9y=-23
=> 4x+9y=23 -------------------(2)
(1) ×2 => 4x + 18y = 50 ----------------(3)
(2)-(3)=> -27y = 27
=> y =-1
putting the value of y= -1 in eq. no.(1)
2x + 9× (-1) = 25
=> 2x -9 = 25
=> 2x = 34
=> x = 17
therefore,
required x= 17
y=-1
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