Need algebra , will mark as brainliest

The answer to your question is:

Step-by-step explanation:

Data

a)

C (0, 0)

D (7, 12)

                   m = (12 - 0) / (7 - 0)

                   m = 12/7        

                   Slope = 12/7

b)

              (y - y1) = m(x - x1)

              (y - 12) = 12/7 (x - 7)

              y - 12 = 12/7 x - 1

              y = 12/7 x - 1 + 12

              y = 12/7 x + 11

c)

              Domain [0, 7]

               Range [0, 12]

b.an increase in a causes b to decrease

r and t.

both are 64 degrees.