The question is very vague, but here's what it tells me. We know that the coordinates are (4, 25) meaning the x is 4 and the y is 25. Since time is x and height is y, all this is saying is this: After 4 weeks, the corn stock is 25 inches. You can go deeper and divide 25 by 4 to find out the rate of growth. That would give you 6.25, meaning The corn stock grows 6.25 inches every week.
If the line is perpendicular the slope is the reciprocal so it would be Y=-1/3x Then if the line has to go through the point (-2,5) the y-intercept must be 5 making the answer Y=-1/3x+5
