1. Find the slope of the line containing the points (9,6) (11,9).

Step-by-step explanation:

Use the point-slope formula

First you have to find m with the formula

Choose whichever point you want as , in this case I'll choose

i think the correct option is the second option.

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -