Answer:
The value of the expression (a +b) = 19
Step-by-step explanation:
The given expression is a + bx.
Case - I when x = 2, (a + bx) = 15
Putting the value of x , we get: a + 2b = 15
or, a = 15 - 2b ...... (1)
CAse II- when x = 5, (a + bx) = 3
Putting the value of x, we get a + 5b = 3
or a = 3 - 5b ....... (2)
Comparing (1) and (2)
15 - 2b = 3 - 5b
or, 5b - 2b = 3 - 15
or, 3b = - 12 ⇒ b = -4
if b = -4, then a = 3 - 5b = 3 + 20 = 23
Hence, a = 23, b= -4
So, the value of (a +b) = 23 - 4 = 19
