Huu Hung, T.; Phuong Chi, N.; Cuong, T. DEVELOPING MATHEMATICAL LITERACY THROUGH AN INSTRUCTIONAL PROCESS: A GRADE 9 CASE STUDYON SOLVING SYSTEMS OF LINEAR EQUATIONS IN TWO VARIABLES. HNUE Journal of Science: Educational Science 2026, 71 (2), 115-126. https://doi.org/10.18173/2354-1075.2026-0030.