MHB Slope of y=-7 as x increases from 8 to infinity

[rootbarb]

The function that passes through (8,3) and every time x increases by 1 unit, the fuction decreases by 7 units

 

[Greg]

It's a linear function so it has the form $y=mx+b$. Can you find $m$ and $b$?

 

[rootbarb]

Is it stating that b is -7? I know y=mx+b but this question sounds so simple has me confused.

 

[Greg]

$m$ = $-7$. Do you see why $m=-7$? Can you solve it now?

 

[MarkFL]

Another formula for a line you may find useful here is the point-slope formula:

$$y=m\left(x-x_1\right)+y_1$$

where $\left(x_1,y_1\right)$ is a known point on the line and $m$ is the slope. :)

 

[rootbarb]

Thanks! Now I understand, def. noting both of your posts in my notepad :) This site is awesome!