Question

5. Find the rate of change for 2000 to 2010, given these ordered pairs in the data set: (2000,286) & (2010,192). Write your answer as a decimal.
a. -0.94
b. -9.4
c. -94
d. -940

6. Write the direct variation of the equation if y varies directly with x and y=45 when x=9.
a. y=5x
b. y=1/5x
c. y=-5x
d. y= -1/5x

7. If y varies directly with x and y=-7 when x=-1, find x when y=-84.
a. 84
b. 7
c. -12

Help, please?