Why couldn't the two elephants go swimming together?

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

What is the equation of a line that passes through points (0, 4) and (-4,-8)?