Algebra-1

The y-intercept of a function is the value of the function when x = 0.

To find the y-intercept for our function, we evaluate f(0): f(0) = -a ⋅ 6⁰ = -a ⋅ 1 = -a.

Thus, the y-intercept is simply -a.

We want the y-intercept to be less than 6: -a < 6.
...