First, we find the equation that represents the situation

Let's replace the points (110,6.60) and (135,8.10) where,


Once we have the slope of the line, we use the point-slope formula to find the equation

The equation that represents the problem is y = 0.06x.
Now, let's transform 25 feet and 15 yards into inches.
We know that 1 foot is equivalent to 12 inches, so

We know that 1 yard is equivalent to 36 inches, so

Then, we evaluate the equation for x = 300 and x = 540.

Hence, Emily will spend $18 for 25 feet of wire, and Andy will spend $32.4 for 15 yards of wire.