Area is proportional to height.
The number of instruments purchased is in direct proportion to the amount payable.
The distance traveled is out of proportion to the remaining distance.
2 ①, 4, 4, 2.4 and 6. Draw it yourself.
② 12/ 1.5=8
③ 12/3=4
④ Form a curve.
3. Point A indicates that the line is 80km.
Point B stands for 400km of the line.
Time and distance are inversely proportional.
45 * 80 = 360 km