Answer with explanation:
Let the number of pounds of peaches bought be represented by = x
Let the total cost of peaches be represented by = y
Since x represents the number of pounds of peaches bought, this should be greater than or equal to 0 means it cannot be negative number.
The equation with respect to y is :

As x is greater than or equal to 0, then y=2x also should be greater than or equal to 0.
This proves that x and y both can be real numbers with equation
