যদি 2x+y = 10 এবং x = 3 হয়,তাহলে x-y = কত?
A -১
B ২
C ৩
D ৪
Correct Answer: Option A
Given that,
2x+y=10
=> 6 + y = 10
=> y = 10-6=4
y=4
then, x-y=3-4= -1
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