Question

This is what the question meant

Answer 1

The line has a slope of -1/5 meaning it will go from left top plot to bottom right plot. It will go down 1 unit and to the right 5. This is what the slope mean is. The -7 is the y intercept. This means the line will cross the y axis at negative 7.
Hope this helps!

Answer 2

You have to make a line that follows this equation:

-1/5x-7=y

If you want you can use Desmos.

Hope this helps!