Please draw a blue line.

He is only earning an income below the poverty line.

He was on the brink of starving to death due to a lack of food.

We need to calculate the asymptote of this function.

The doctor applied X-rays to my arm.

All of these points are on the same line.

This electrical appliance is made of copper wire.

He observed the stars using the reticle of the telescope.

The study of sound waves is an important part of acoustics.

He began to draw the rough lines, creating a rough shape of the picture.