Answer:
discount = price times % off
discount = 22.50 x 0.20
discount = $4.50
Step-by-step explanation:
Answer:
Step-by-step explanation:
Answer: Last option.
Step-by-step explanation:
The equation of the line in slope-intercept form is:

Where m is the slope and b the intersection with the y-axis.
You can observe in the graph that the line passes through the origin, then:

Choose two points of the line and calculate the slope with:

Points: (2,3) and (-2,-3)
Substitute values, then the slope is:

Substituting "m" and "b" into
, you get that the equation is:

This can be written as:

Y = 2x - 10
2x = y + 10
x = (y + 10)/2
Therefore, f^-1(x) = (x + 10)/2
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