Solve - pv + 40 < 65 for v

solve 7w - 3r = 15 for r

v > - 25/p

r = - 5 + 7/3 w

Step-by-step explanation:

- pv + 40 < 65

Subtract 40 from each side

- pv + 40-40 < 65-40

-pv < 25

Divide each side by - p (remember to flip the inequality since we are dividing by a negative)

-pv/-p > 25/-p

v > - 25/p

7w - 3r = 15

Subtract 7w from each side

7w-7w - 3r = 15-7w

-3r = 15-7w

Divide by - 3

-3r/-3 = (15-7w) / -3

r = - 5 + 7/3 w