sallybob0
06.05.2021 •
Mathematics
Durante el recreo, 7 estudiantes estaban leyendo libros. Había 17 estudiantes jugando en el patio de juego. ¿Cuántos estudiantes menos estaban leyendo libros que jugando en el patio de recreo?
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Ответ:
Multiplying the first equation by 2 and adding the equations results in 20x = 10. The solution of the system is (1/2, 5). The system 8x + 7y = 39 and 20x = 10 is formed by replacing 4x –14y = –68 by a sum of it and a multiple of 8x + 7y = 39.