What is the yintercept of the function f(x) + -2/9x + 1/3?

X+ y = 5 ; x - y =3 solve using linear combination

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?

At the movie theatre, child admission is $5.20 and adult admission is $9.70. on sunday three time as many adult tickets as child tickets were sold, for a total sales of $788.90. how many child tickets were sold that day?