part d does this curved line represent a function? if not, at what points does it fail the verticals line test ?

It does not represent a function.

It fails at (3,1), (3,-1), (3,-3.5). The points are variable, the x must stay the same to ensure you tested for VCL.

Step-by-step explanation:

The vertical line test is the easiest test to see if a line is a function. All you have to do is draw a vertical line across the "function". If AT ANY TIME, the vertical line intersects more than once with the "function", it has failed the vertical line test (VLT) and is not a function.

Please look at the image attached to see how to do the VLT. Please ignore my line drawing and mouse-writing :)

hdjd

step-by-step explanation:

answer

you start with $5 and save $10 a week until you have at least $45wer

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