Identify the slope, m. This can be done by calculating the slope between two known points of the line using the slope formula.
Find the y-intercept. This can be done by substituting the slope and the coordinates of a point (x, y) on the line in the slope-intercept formula and then solve for b.
Answer:
30.31%
Step-by-step explanation:
Mark up on selling price is given by markup*100%/selling price
In this case, markup is given as $870 while the selling price is $2870 hence the percentage of narkup to selling price will be given by 
Therefore, the percentage of markup to selling price is approximately 30.31%
Answer:
$3 off which is $27
Step-by-step explanation:
10% of 30 is 3 so you would subtract 30 - 3
and you get $27
Answer:
Domain: All real numbers
or

Range: All real numbers
Or

Step-by-step explanation:
The given function is 
This a polynomial function of degree 1.
Polynomial functions are continuous everywhere.
The function is therefore defined for all real values of
.
The domain is 
If we let 
Then,
.
is also defined for all real values of
, hence the range is also all real numbers or 