16.
(a)
Simply
3b + 5b - 2

Combine like terms

1. Add 3b and 5b (combine like terms)

2. After adding you are supposed to get 8b

3. The -2 would stay as it is because we can't add it to 8b

4. So the answer would be 8b-2

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)