Final answer:
The equation to represent the constraint of Diego spending $30 on both raisins and walnuts is 4x + 8y = 30.
Step-by-step explanation:
The equation to represent the constraint of Diego spending $30 on both raisins and walnuts can be written as:
4x + 8y = 30
Where x represents pounds of raisins and y represents pounds of walnuts.
In this equation, 4 represents the cost of raisins per pound and 8 represents the cost of walnuts per pound.
The total cost, $30, is on the right side of the equation.
To solve this equation, you can substitute different values for x and y and see which combination satisfies the equation.