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Suppose (-3, 3) is a point on the graph of y = f(x). What is a point that will be on the graph of y = f(-3x) + 3? Enter the Coordinates as (a,b)

1 Answer

3 votes

Answer:

(1, 6)

Explanation:

You want the point on the graph of y = f(-3x) +3 that corresponds to the point (-3, 3) on the graph of y = f(x).

Transformation

The transformation y = f(-3x) +3 has three parts:

  • horizontal compression by a factor of 3 (x ⇒ 3x)
  • reflection over the y-axis (x ⇒ -x)
  • vertical translation up 3 units (f(x) ⇒ f(x)+3)

When we perform these transformation on the point (-3, 3), we see that ...

  • horizontal compression: (-3, 3) ⇒ (-1, 3)
  • reflection over the y-axis: (-1, 3) ⇒ (1, 3)
  • vertical translation up 3 units: (1, 3) ⇒ (1, 6)

The point (-3, 3) on y = f(x) corresponds to the point (1, 6) on the y = f(-3x)+3.

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Additional comment

The mapping of points from y = f(x) to y = f(-3x)+3 is ...

(x, y) ⇒ (-x/3, y+3)

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User Saasira
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