To build the graph that represents the function 
you have to put two points (x, y): (-2, 0) and (0, -4). Then just draw the line across these points like that:
An item regularly priced at $80 is on sale for 20% off. There is a 3% sales tax. What is the sale price before sales tax?
2 answers:
Answer:
The answer is $64.
Step-by-step explanation:
An item regularly priced at $80 is on sale for 20% off.
This amount becomes:
dollars
So, price after discount is dollars
Given is that there is a 3% sales tax.
So, sales tax must have been applied to $64 before final bill.
And we have to tell the sale price before tax, so the answer is $64.
Therefore, the answer is $64.
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