Identify the coordinates of four points on the line with each given slope and y intercept slope=-1y intercept=8

Is the function x=-1y+8 if so that can be changed to: y=-x+8. Then this is just a simple line and the y intercept is (0,8) and the x intercept is (8,0). Those are two points on the graph other points are (1,7) (2,6) (3,5) etc