Find the slope of a line that goes through the pints ( 1,-4) and (7,-4)

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse.a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?

Me i’m stuck on all these questions besides the two bottom ones