I want to know the answer to the following question:
What achievement of the Han era can be used to help solve linear equations?
All the background I'm provided with is that "Han-era mathematical achievements include solving problems with right-angle triangles, square roots, cube roots, and matrix methods, finding more accurate approximations for pi, providing mathematical proof of the Pythagorean theorem, use of the decimal fraction, Gaussian elimination to solve linear equations, and continued fractions to find the roots of equations.". Is that enough to answer the question?
Answer: yes