1. A system of equations to determine the cost of a bottle of juice, is <u>12x + 2.70 = 15.78</u>.
2. From the equation, x = $1.09.
<h3>What is an equation?</h3>
An equation is a mathematical statement that shows that two values are equal.
A system of equations uses numbers and variables.
<h3>Data and Calculations:</h3>
The cost price of a bag of chips = $2.70
The total cost of snacks = $15.78
The total cost of 12-pack of juice bottles = $13.08 ($15.78 - $2.70)
Therefore, a bottle of juice = $1.09 ($13.08/12)
<h3>Equations:</h3>
Let a bottle of juice = x
Total cost of snacks = $15.78
2.70 + 12x = 15.78
or 12x + 2.70 = 15.78
12x = 13.08
x = 1.09 (13.08/12)
Learn more about equations at brainly.com/question/2972832
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