Edgar wants to plot the ordered pair (1.8,-1.2) on a coordinate plane. on each axis, one grid square equals 0.1. starting at the origin, how can edgar find (1.8,-1.2)

Starting on the x axis, Edgar has to move 18 squares to the right. Once he gets to the edge of the 18th square, he has to move down 12 squares.

How did I get these numbers? Let me tell you a story:
If one unit on the graph is equal to 1, you got to divide the unit by 1. That's how many spaces you move. If one unit on the graph is equal to 2, you have to divide the coordinate by 2. And so on.
For us, the unit is equal to 0.1. So we divide the 1.8 and -1.2 by 0.1, which gives us 18 and -12 respectively. We would move over by those numbers. Just make sure your little units are labeled in multiples of 0.1.