m=2
R=(-∞, ∞)
D=(-∞, ∞)
1) In the graph, below let's find out the slope of that line, picking two points:
(0,4) and (-2,0)
So the slope is m=2. As when x=0 y=4, then we can write it as y=2x+4
2) The Range is the set of outputs of that function.
As this is a continual function, without algebraical undefinitions then we can write the Range as:
R=(-∞, ∞)
And the Domain similarly is defined for all the values of x, in R. So
D= (-∞, ∞)