To express the relationship between the weight of the ice cream custard (in ounces) and its cost (in dollars) as a linear equation, we can use the form:
\[ y = kx \]
where:
- \( y \) is the cost,
- \( x \) is the weight in ounces,
- \( k \) is the constant of proportionality (the cost per ounce).
Since the problem states that the cost is directly proportional to the weight, we need to find the constant of proportionality \( k \).
If you have specific values from the graph (such as a weight in ounces and the corresponding cost), you could substitute those values into the equation to find \( k \).
For example, if the graph shows that 1 ounce costs $2, then:
\[ k = \frac{y}{x} = \frac{2 , \text{dollars}}{1 , \text{ounce}} = 2 \]
Thus, the equation would be:
\[ y = 2x \]
You can replace "2" with whatever the actual proportionality constant is from the graph to complete the equation. If you need more specific help, please provide the values shown on the graph!