AYUUDDD resuelve el siguiente sistena de ecuaciones mediante el método gráfico

x + y = 3

4x + 4y =12​

Find the value of the cosine for angle a

For the equations below which statement is true ? -2x=14 6x=-42

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning