Question

How to find the x and y intercept of f(x)=400-4/5x

Answer 1

To find the x intercept, set y = 0, then solve for x:

Remember y = f(x) so you have
y = 400 - (4/5)x

Set y = 0
0 = 400 - (4/5)x

Add (4/5)x to both sides:

(4/5)x = 400

Multiply both sides by (5/4)
x = (5/4)(400)
x = (5)(100)
x = 500

Answer 2

Using the same logic, you'll be able to find the y-intercept.

Answer 3

btw, @dev165, try not to post the same question twice.