How are part to part ratios different from part to whole ratios?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided