Sure. The point slope formula is y-y1 = m(x-x1)
Therefore, when we plug in your points, we get:
y+6 = -0.38(x-5)
Therefore, the answer is the last one, or "d".
For the second question, we see that the time multiplied by 7 gives us the height. We need to points to write it in point slope and find the slope. We'll use (3, 21) and (5, 35). To find the slope, we use y2-y1/x2-x1. That gets us 35-21/5-3, or 14/2, which equals 7. From here, we already know the answer, because we know it's linear, and there's only one option with the slope of 7. Let's go on so you can see the concept.
We'll use one of those two points (3,21) to write it in point slope with the formula I gave you. We have: y-21 = 7(x-3). That gives us the answer of b. Hope this helps, and let me know if you have any more questions.