which situation best represent a proportional relationship

kelly sold 2 rings for $3 and 3 rings for $6
lawrence packed 27 plates in 9 boxes and 81 plates in 27 boxes
jeff ran 4 miles in 20 minutes and 6 miles in 24 minutes.
francesca placed 8 pencils in 2 cases and 16 pencils in 8 cases.

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w