Find the slope from the two points (9,-2) and (9,7).
find the slope from the two points (-4,-6) and (5,-6)

Step-by-step explanation:

a) We have been given the points (9,-2) and (9,7)

Use the slope formula to solve this.

m= y2-y1/x2-x1

where (x1,y1)=(9,-2)

and (x2,y2)=(9,7)

m=7-(-2)/9-9

m=7+2/0

m=9/0

Having a zero in the denominator means the slope is undefined. Whenever you have a vertical line your slope is undefined

b) We have been given (-4,-6) and (5,-6)  

Use the slope formula to solve this.

m= y2-y1/x2-x1

where (x1,y1)=(-4,-6)

and (x2,y2)=(5,-6)

m=-6-(-6)/5-(-6)

m=-6+6/5+6

m=0/11

If the numerator of the fraction is 0, the slope is 0. This will happen if the y value of both points is the same. The graph would be a horizontal line and would indicate that the y value stays constant for every value of x

Step-by-step explanation:

let say he sold 5 bagels then he would sell 5 bagels

12-5=7 , b=7

replace in 12-5=7

b=12-s