On the other end of the spectrum, the materials with the lowest conductivities, or best insulators, are glass, ceramic, rubber and some plastics. Not all materials are classified as insulators or conductors, because in the real world, they don't do a particularly good job of either one.
The point where the graph of a function crosses the x-axis or y-axis. y-intercept. The point where the graph crosses the y-axis. In a linear equation of the form y=mx+b. The y-intercept is the constant b. constant of proportionality. The constant ratio between two quantities. EX: 1/4, 2/8, 3/26.
Now letâs look at the y-intercept. Looking at the graph, you can see that this graph never crosses the y-axis, therefore there is no y-intercept either. Another way to look at this is the x value has to be 0 when looking for the y-intercept and in this problem x is always 5.