a = 8

b = ?
c = 17

To find the value of b, we need more information or an equation.

To find the value of "b", we need more information or an equation involving "b". Could you provide more details or an equation?

To find the value of 'b' in the equation:

a = 8
b = ?
c = 17

You can use the equation:
a + b = c

In this case, substituting the given values:
8 + b = 17

To find the value of 'b', you can solve this equation for 'b' by isolating it on one side of the equation, and performing the same operation on both sides:

8 + b - 8 = 17 - 8

Simplifying this equation gives:

b = 9

So, the value of 'b' is 9.