First find slope of first line given the two points Slope is change in y over change in x 0-1 over 5-0 Slope = -1/5 Slope of the line perpendicular to this line has a slope that is the negative reciprocal. Slope of the new line is 5 You are given the y intercept with the first point so put these things together in the slope intercept formula Y=5x +1