help and i give you the brainlest please

Answer:
The slope is 0.50 which means that for every change in x by 1, there is a change in y by 0.50
Answer:
• In consideration with the general equation of a line:
[tex]{ \rm{y = mx + b}}[/tex]
→ m is the slope
[tex]{ \rm{C = 9 + 0.50t}} \\ \\ { \rm{C = 0.50t + 9}}[/tex]
• from comparison, m is 0.50
Answer: slope is 0.50
Interpretation: The Total cost of using a computer varies positively with the time.
This means total cost of using a computer is directly proportional to the time of usage.