16) y intercept is -6
17) y intercept is 2
18) y intercept is -4...1/2 (-4) = -2 -2 = !4
19) y intercept is 10....3 × 2 + 4
Hello.
First of all, let the number be t.
8 times t can be written like this:

Notice that the number is before the variable and the times sign (×) is not there.
We can write it as 8×t, but we usually write it as 8t.
The sum of means we add:
8t+21
Now, "less than" is "<" :

Therefore, the answer is

I hope it helps.
Have a nice day.

Answer
Point b is (0,0) Point a is (3,-2) Im not doing the second part
Step-by-step explanation: