This equation shows how Echo the puppy's weight varies with age.

p = 4a

The variable a represents Echo's age in months, and the variable p represents Echo's weight in pounds. How heavy was Echo at 3 months old?

The equation given is:

\[
p = 4a
\]

Where:
- \( p \) is Echo's weight in pounds,
- \( a \) is Echo's age in months.

To find how heavy Echo was at 3 months old, substitute \( a = 3 \) into the equation:

\[
p = 4(3) = 12
\]

So, Echo was **12 pounds** at 3 months old.

Would you like more details or have any questions? Here are five questions that expand on this:

1. What would Echo's weight be at 6 months?
2. If Echo weighs 20 pounds, how old is she?
3. Can this linear relationship continue indefinitely? Why or why not?
4. How would the equation change if Echo gained 5 pounds immediately after birth?
5. What does the slope of the equation \( p = 4a \) represent in terms of Echo's growth?

**Tip:** The number "4" in the equation represents how much weight Echo gains per month.

Find out how to calculate a puppy's weight using the linear equation p = 4a, where p is the weight and a is the age in months. This math problem demonstrates proportional relationships and basic algebra, suitable for students in Grades 6-7.

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