In: Economics
The budget line is given as follows:
X*Px + Y*Py = 100*Px + 25*Py
=> X*1 + Y*13 = 100*1 + 25*13 (since X is the numeraire good => Px = 1)
=> X + 13Y = 425
Inn order to find the Y intercept, we put X = 0
=> 13Y = 425
=> Y = 425/13 = 32.69