Is my graph correct?
And what is the range of the function above?

Graph is incorrect.
Find points (x,y)
If x=#, what does y=?
Example:
Y=5x+4
Y=5•0+4
Y=0+4
Y=4
Points:
(0,4)
(-1,1)
(-2,-6)
Also, only draw the line in areas where x≤0
Meaning nothing should be on the right half of the square.
The range means what Y values are possible?
When draw properly, with nothing on the right half, the highest Y value will be 4.
So, the range is y≤4
Answer:
The range is f(x) <= 4.
Step-by-step explanation:
The general form of a straight line is y = mx + c where m = the slope of the line and c = the y-intercept. If we compare this with y = 5x + 4 we see that the slope = 5 and the y-intercept is 4.
Your graph has got the wrong slope . The slope should be the coefficient of x which is 5. The slope of your graph ( rise / run) = 1. The y-intercept is +4 which you have correct.
Also since the domain is x <= 0 the line should stop
at the point (0, 4) because the maximum value of y is 4.