First find the slope of the line given by changing it into slope intercept form. 0.5x-5y=9 -5y=-0.5x+9 y=0.1x-9/5 The slope is 0.1 To find a perpendicular slope, find the negative reciprocal. The reciprocal of 0.1 is 10 The negative of 10 is -10 Final answer: -10
