Question

if X=1,y=2 are solution of a2x +ay=3 the find the value of a
​

Answer 1

x = 1 and y = 2

a²x + ay = 3

a² x 1 + a x 2 = 3

a² + 2a - 3 = 0

a² + 3a - a - 3 = 0

a ( a + 3 ) - 1 ( a + 3 ) = 0

( a + 3 ) ( a - 1 ) = 0

a = 1 or - 3