Question

Can someone please explain how I do this? I think it looks familiar, but I can’t remember it.

Answer 1

To find the equation of a line in slope-intercept form (y=mx+b) you follow the next steps:

1. Find the slope (m). Use two points in the line in the next formula:

`m=(y_2-y_1)/(x_2-x_1)`

Points: (0,40) and (8,0)

`m=(0-40)/(8-0)=(-40)/(8)=-5`

2. Identify the yintercept: It is the value of the function when it cross the y-axis, or the value of the function when x=0

y-intercept in the given line is 40.

Then, you have the next equation in slope-intercept form for the given line:
`y=-5x+40`