For this case, the first thing we must do is define variables.
We have then:
x: number of days
y: number of total pounds.
For 12 elephants, we have the expression is:
Then, for the given number of days, we have x = 5.
Substituting the value of x we have:
Answer:
an expression to represent the number of pounds of food a herd of 12 elephants eat in 5 days is: