Let \( b \) represent the number of balloons that Alexa popped. According to the information provided, Krista popped 6 balloons, which is 1 less than the number of balloons popped by Alexa.
We can express this relationship with the following equation:
\[ b = 6 + 1 \]
Simplifying gives:
\[ b = 7 \]
This means that Alexa popped 7 balloons.
So, the complete working equation that represents the number of balloons \( b \) that Alexa popped is:
\[ b = 6 + 1 \]
or
\[ b = 7 \]