Question 934584
Start with the graph of y = 4x+5


{{{ drawing(500, 500, -10, 10, -10, 10,grid(1),graph( 500, 500, -10, 10, -10, 10,0,4x+5))}}}


Now only draw the portion that makes {{{x<=0}}} true (so everything to the left of 0 and we include 0 itself).


{{{ drawing(500, 500, -10, 10, -10, 10,grid(1),graph( 500, 500, -10, 10, -10, 10,0),green(line(0,5,-10,-35)),green(circle(0,5,0.2)),green(circle(0,5,0.15)),green(circle(0,5,0.1)),green(circle(0,5,0.05)))}}}


Notice how I erased the portion to the right of x = 0. There is a closed circle at x = 0.


We can see the range is {{{y<=5}}}. In interval notation, the range is <img src="http://www.sciweavers.org/tex2img.php?eq=%28-%5Cinfty%2C5%5D&bc=White&fc=Black&im=jpg&fs=12&ff=arev&edit=0" align="center" border="0" alt="(-\infty,5]" width="68" height="18" />

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