[Algebra] How does this example question find the intercepts?

Pardon my cluelessness as I've always really struggled with wrapping my brain around math and also asking for help with math. I'm doing taking a college Algebra course that uses OpenStax as it's curriculum. In example 5.2 in chapter 5, it shows step by step how to solve a system of linear equations by graphing.

However, in step 2, it shows to graph the second line using the intercepts of x - 2y = 6 and lists them as (0,-3) and (6,0). The second one I think is the x-intercept found from substituting 0 for y in x - 2y = 6 and solving the equation, but how what method do I use to find the first ordered pair (0,-3). Is that the y-intercept? I feel like this is an easy question to solve but I'm extremely frustrated and just can't figure it out for the life of me.