To represent the number of balloons, \( b \), that Alexa popped, we can set up the equation based on the information given:
Krista popped 6 balloons, which is 1 balloon less than what Alexa popped. Therefore, we can express this as:
\[ b - 1 = 6 \]
Now, we can solve for \( b \):
\[ b - 1 = 6 \] \[ b = 6 + 1 \] \[ b = 7 \]
So, the completed equation is:
\[ b - 1 = 6 \] And the solution is:
\[ b = 7 \text{ balloons} \]