X.3 Evaluate two-variable equations: word problems

YJT
This equation shows how the total number of postcards Lara buys is related to the number of days she spends on vacation.

p = 2d

The variable d represents the number of days she spends on vacation, and the variable p represents the total number of postcards she buys. After 3 days of vacation, how many total postcards will Lara have bought?

postcards

1 answer

To find the total number of postcards Lara buys after 3 days of vacation, we can substitute \( d = 3 \) into the equation \( p = 2d \).

Plugging in the value:

\[ p = 2(3) \] \[ p = 6 \]

Therefore, after 3 days of vacation, Lara will have bought a total of 6 postcards.