(1 point) Suppose that ax + by = c is the equation of a non-vertical line. Find the slope of this line. Slope is -a/b Suppose that the vector ? = ai + bj is not vertical. Find the slope of this vector. Slope is b/a Use your above answers to find an equation for the line through the point P = (-6, 7) perpendicular to the vector –5i +8j. Hint: Think about the relationship between the slopes of two perpendicular lines. Line is y=-5/8x+13/4 (Enter your answer in one of the standard forms for the equation of a line.)