Ngoc Giang, N.; Huyen Trang, P.; Thi Nga, N.; Loc Thuan, H.; Vu Linh Dan, M. INTEGRATING MATHEMATICS AND ECONOMICS WITH THE SUPPORT OF GEOGEBRA SOFTWARE IN TEACHING THE SYSTEM OF FIRST-ORDER INEQUALITIES WITH TWO UNKNOWNS AT THE HIGH SCHOOL LEVEL. HNUE Journal of Science: Educational Science 2024, 69 (5B), 191-200. https://doi.org/10.18173/2354-1075.2024-0147.