Question

2] Check whether (2,1) is a solution of the equation x – 2y = 4.​

Answer 1

Answer:

Let x=2, y=1

x-2y=4

2-2×1 = 4

2-2=4

0=4

LHS is not = RHS

Answer 2

Solution:

On substituting x with 2 and y with 1 in the equation

x - 2y = 4, we get,

2 - 2(1) = 4

⇒ 2 - 2 = 4

⇒ 0 = 4

BUT

0 ≠ 4

∴ (2, 1) is not the correct solution to the equation x - 2y = 4.