what is (1,-9) and (-3,-9) slope intercept from

Answer 1

the y coordinates are the same

the equation is y =-9

in slope intercept form? It's y = (0)x -9 where 0 = the slope and -9 is the intercept/

y = (0)x -9

is y = 0-9

which is

y =-9

You might try plotting the two points and drawing a straight line through them. It's a flat horizontal line with slop = 0