I can graph it but I don’t get it.

Step-by-step explanation:

The 2 in 2x is the slope. You can also think of it as 2/1. The -3 is the y-intercept. This is the number that the graphed line touches on the y-intercept.

So, you could start at (0,-3), then use the slope to plot the next point. Graph the next point by going up two boxes from (0,-3), and then going one box to the right. It should look like this:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)