(Q1). Solve the given equation.

2x
a
 +
y
b
 = 2
x
a
 -
y
b
 = 4

Given:

2x
a
 +
y
b
 = 2 ..................(1)
x
a
 -
y
b
 = 4 ..................(2)
x
a
 = ⇒ x =
a
 = a

Substituting x = a in the equation (1) we get

2
a
 (a) +
y
b
 = 2
⇒ +
y
b
 = 2
⇒
y
b
 = -

⇒ y = -b

∴ The solution (x, y) = (a, -b)