I'm very bad at explaining things so im sorry if this doesn't make any sense
the y axis goes up
the x axis goes sideways
to fill in the "y = ____x+_____"
you find a point on the line, see how far up it is from 0,0 and put that in the first blank space, in this case its 3. then you find how much it goes over on the x axis. in this case its 1 over. so you would put 1.
