# SAT Math Multiple Choice Question 156: Answer and Explanation

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**Question: 156**

**6.**

Which of the following equations best describes the figure above?

- A. y = -x
^{4}+ 6 - B. y = -(x
^{2}+ 6) - C. y = -x
^{2}+ 6 - D. y = x
^{4}+ 6

**Correct Answer:** B

**Explanation:**

B The graph shown is a regular parabola that has been turned upside down and moved down 6. The equation of a regular parabola that points upward is y = x^{2}. Therefore, the graph of a parabola that points downwards is y = -x^{2}. Eliminate (D) because that answer is missing the negative sign. To move a parabola down 6 units, a 6 must be subtracted from the equation of the parabola. Eliminate (A) and (C), which add 6 instead. Choice (B) can be rewritten as y = -x^{2} - 6. The correct answer is (B).