Let's find 2 decipherable points on the graph.
1. (0, 4)
2. (4, 0)
Now, solve for slope.
Slope formula:

Plug in and solve:

Slope:

Finally, plug into point-slope formula and solve for slope-intercept.
Point-slope formula:

where m = slope
Plug in and solve for slope-intercept.

Answer:
