Answer:
5.2
Step-by-step explanation:
I hope this works :)
1 & 2 are functions
3 & 4 are not a functions
y = m x + b is a linear equation.
This equation is in the slope - intercept form, where m is the slope and b is y - intercept.
For example: y = 2 x + 5
In this equation: m = 2 ( the slope ) and b = 5 ( the line intercepts y-axis at the point ( 0, 5 ) ).
You will substrate the percentage of the sale price with the regular price