Ejercicio #1: ¿Cuál es el área de un rectángulo sabiendo que su perímetro mide 16 cm y que su base es el triple de su altura? como se a podido plantear o como se a podido llegar a esa conclusion​

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

When y’all answer can y’all explain too !

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]