Illustrative
N'A Mathematics
3. Jada knows she can rewrite the equation as r = 48 – 0.8p. In Jada's equation, which is
the independent variable? Which is the dependent variable?
Solution:
1. 10 ounces of peanuts would cost $2 since 0.2 · 10 = 2.16 ounces of raisins would
cost $4 since 0.25 · 16 = 4. Together, they would cost Jada $6, leaving her with $6.
2. 35 ounces of peanuts. If Jada wants 20 ounces of raisins, then 0.2p +0.25 · 20 = 12
must be true, which means p = 35.
3. p is the independent variable and r is the dependent variable for Jada's equation.