Check the picture below, let's use those two points on the line to get its slope.

Answer:
The system has an infinite set of solutions 
Step-by-step explanation:
From the first equation:




Replacing on the second equation:




This means that the system has an infinite number of solutions, considering:



The system has an infinite set of solutions 
Answer: 1668.2
Multiply 1668.2×45 and get 75,069
Answer: -11
Step-by-step explanation: Hope this helps