Answer:
I. If labor and capital are perfect substitutes in production, the isoquant is a straight, downward-sloping line.
II. If a company needs to use inputs in fixed proportion such that the capital to labor ratio is always 2, the firm's isoquants are L-shaped.
Step-by-step explanation:
Perfectly substittuable goods have straight downward sloping ICs, and have corner solutions .
Complementary goods (used in fixed proportions) are L shaped always , In case of min(x,y) function, the answer is the value of x or y which ever is minimum and not their sum.
Therefore, Only statements I and II are true.