Answer is slope of -1/2 and graph attached shows the drawing of rise and run
Explanation -
Here we have a Rise of ( - 3 ) and a Run of ( 6 ) which we find by drawing a triangle that connects points where the line crosses the y-axis at ( -3) and the x-axis at (-6).
Slope is the Rise over Run so -3/6 simplified to -1/2 slope.