Question

how do I find the slope of y=-x

Answer 1

ideally, but watching the movement of y as you change x by a factor of 1

Answer 2

so the answer is -1?

Answer 3

when x=0; y=0
when x=1 y =-1

the slope is the -1 because that is how y moved

Answer 4

after doing a bunch of these you begin to realize that the number in front of "x" is the same as the slope; in this case its a -1