Determine the unit rate for 1 bag of chips if 5 bags cost $6.25; the proportional relationship is described by 5y=$6.25x

To determine the unit rate for 1 bag of chips, we start with the given relationship: 5 bags cost $6.25.

To find the cost for 1 bag, we can divide the total cost by the number of bags:

\[ \text{Cost per bag} = \frac{\text{Total cost}}{\text{Number of bags}} = \frac{6.25}{5} \]

Calculating this:

\[ \frac{6.25}{5} = 1.25 \]

Thus, the unit rate for 1 bag of chips is $1.25.

Given the options, the correct answer is:

$1.25.