A) 2
B) 4
C) 6
D) 3
Correct Answer: B
Solution :
\[2x-y=9\] \[\Rightarrow \]\[y=2x-9\] ?(i) \[\therefore \]\[2x-5y=5\] \[\Rightarrow \]\[2x-5(2x-9)=5\] \[\Rightarrow \]\[2x-10x+45=5\] \[\Rightarrow \]\[-8x=5-45=-40\] \[\Rightarrow \]\[8x=40\Rightarrow x=\frac{40}{8}=5\] \[\therefore \]From equation (i), \[y=2x-9=2\times 5-9=1\] \[\therefore \]\[x-y=5-1=4\]You need to login to perform this action.
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