Question

Look at this graph.

What is the equation of the line in slope-intercept form?​

Answer 1

y = 4x -80

Explanation:

We need the slope and the y intercept.

The y intercept is -80. This is where the line crosses the y axis.

The slope is the change in y over the change in x.

Let's go from point (0,-80) the y intercept the the point that cross the x axis (20,0) Start at -80, how many units to you go up until you are at the same level as point (20,0)? 80 units. Now, from (0,0) how many units do you go right to get to (20,0)? 20.

We end up go 80 unit up and 20 units right, this would be written
`(80)/(20)` Which simplifies to 4. This is our slope.

Slope (m) = 4

y intercept (b)= -80 Plug those into

y = mx + b

y = 4x -80