Question

if X=2a+1 and Y=a-1 is a solution of the equation 2x-3y+5=0 find the value of a

Answer 1

Putting x = 2a + 1 & y = a - 1 in following equation we get

2x - 3y + 5 = 0

= 2 ( 2a + 1 ) - 3 ( a - 1 ) + 5

= ( 4a + 2 ) - ( 3a - 3 ) + 5

= 4a + 2 - 3a + 3 + 5

= a + 10

a + 10 = 0

a = - 10