A computer manufacturer built a new facility for assembling computers. There were construction and new equipment costs. The company paid for these costs and made combined profits of $40 million after 4 years, as shown in the graph: There is a graph of a line with Years on the x axis and Profits in millions on the y axis that passes through 1, negative 50 and 4, 40.

Which equation most closely represents the line depicted in the graph?

f(x) = −30x + 80
f(x) = −40x + 4
f(x) = 40x − 4
f(x) = 30x − 80