The sign: Foamy or bubbly urine. What it means: You could have kidney disease. When your kidneyâs filtering units arenât working properly, that can lead to a build-up of protein in your urine. The protein then creates a foamy appearance when it hits the water in the toilet.
This gives us a point in the x1-x2 or phase plane that we can plot. Doing this for many values of t will then give us a sketch of what the solution will be doing in the phase plane. A sketch of a particular solution in the phase plane is called the trajectory of the solution.
The Coordinate Plane. A coordinate plane is the rectangular plane formed with two number lines: one is vertical number line and the other one is the horizontal number line. In the horizontal number line, at left side, negative numbers are placed and at the right hand side, the positive numbers are placed.