So slope is known as rise over run, or x/y. in your case of 3/4, the slope is y=3 and x=4. The slope is equal to the growth rate. It measures steepness, so in real life you could apply it to finding the steepness of a hill for construction, or perhaps how steeply your speed grows from 0 to 100 when driving a car.
Negative means less.
Positive means more.
as a negative # moves farther away from 0, it becomes smaller.
i.e.
-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7
-5 less than 7.
