exam Maths Puzzle Numerical Ability

I Need help with understanding the Bondary line of a graph.
Like for this problem -x+4y<-4.

Also, when you have a fraction like 2/3 you go up 2, but how do you know to go left or right?

HELP ASAP!

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exam Other Question
write the equation of the line passing through each of the given pairs of points. the result in slop- intercept form,if its possible.




(2,-3) and (2,4) Write the following as a common fraction or mixed number.
5.679
Could someone please help. Is my answer correct?
5 and 679/100