Is r=b2 + 1 proportional?

Yes,it was proportional...

Step-by-step explanation:

To tell if 2 variables are directly proportional while looking at their graphs,note if their x-and y- intercept coordinates are changed by the same factor.If they are,they are proportional.

If you don't have a graph,you can tell if

2 variables are directly proportional by writing down the equation of the line.

answer: 33 ( approx)

step-by-step explanation:

since, in the linear regression formula, the slope is the a in the equation y = b + ax ( by comparing it with the general equation of line y = mx + c )

where,

here given table is,

price ($), x   :           18         23       25       29       30       33

pairs sold, y :         16         13         10       8         6       2

so, ,   ,   ,

and   ,

thus, slop of the given line is,

⇒  

⇒   ≈ 33

it has to have an angle of 90 degrees