Rewrite the sales tax as a decimal by moving the decimal point 2 places to the left.
8% = 0.08
Ow multiply that by the price:
42 x 0.08 = 3.36
The sales tax is $3.36
y = -4x - 1
It is a linear function different from the constant function. Therefore, if the range is only one number, then the domain is only one number too.
Let's calculate it:
y = -25 → -4x - 1 = -25 |add 1 to both sides
-4x = -24 |divide both sides by (-4)
x = 6
Answer: The domain = {6}.
I'd recommend placing your points on coordinates (3,2) and (-2,1)
Here's a picture to help as well
