Ayuda no entiendo como hacer esos 4 puntos, ¿me pueden ayudar con las respuestas? por favor

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

Find the value of x. give reasons to justify your solutions! h ∈ ig