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