I'm so lost I have no idea. Please help

Question

Write the equation of the line that represents this graph. Show your work or explain how you determined the equations.

graph of line going through ordered pairs (0, 300) and (450, 0)

Answer 1

slope of line = (0-300)/(450-0) = -2/3

so the equation is y = (-2/3)x + b
but b is the y-intercept and it is given as 300, so

y = (-2/3)x + 300

I don't understand why you say you are lost.
This type of question is as basic as they come in this topic.

Answer 2

thank you
I understand now