Let's convert the equation in point-slope form to slope-intercept form.
y - 4 = -(x - 6) Multiply everything out. y - 4 = -x + 6 Add 4 to both sides. y = -x + 10
To be perpendicular, the slope of the new has to be the reciprocal of the other line. To slope in this equation is -1/1. To get the reciprocal, flip the numerator and denominator and change the sign too.
It would be this equation because you start at 5, which is the y-intercept, then you add 0.75 for every pound of apples. So on a graph you would start at 5 on the y-line then go up by 0.75
