SSAT Upper Level Math : Transformation

Study concepts, example questions & explanations for SSAT Upper Level Math

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Example Questions

Example Question #201 : Coordinate Geometry

Function 1

What equation is graphed in the above figure?

Possible Answers:

\displaystyle y = \left \lfloor x\right \rfloor + 4

\displaystyle y = \left \lfloor x\right \rfloor - 4

\displaystyle y = \left \lceil x\right \rceil+ 5

\displaystyle y = \left \lfloor x\right \rfloor + 5

\displaystyle y = \left \lceil x\right \rceil+ 4

Correct answer:

\displaystyle y = \left \lceil x\right \rceil+ 4

Explanation:

The least integer function, or celing function, \displaystyle f(x) = \left \lceil x\right \rceil, pairs each value of \displaystyle x with the least integer greater than or equal to \displaystyle x. Its graph is below.

Ceiling function

The given graph is the above graph shifted upward four units. The graph of any function \displaystyle y = f(x) shifted upward four units is \displaystyle y = f(x) + 4, so the given graph corresponds to equation \displaystyle y = \left \lceil x\right \rceil+ 4.

Example Question #202 : Coordinate Geometry

Function

Give the equation graphed in the above figure.

Possible Answers:

\displaystyle y = |x+5|

\displaystyle y = |x| + 5

\displaystyle y = |x-5|

\displaystyle y = |5x|

\displaystyle y = |x| -5

Correct answer:

\displaystyle y = |x| + 5

Explanation:

The graph below is the graph of the absolute value function \displaystyle f(x)= |x|, which pairs each \displaystyle x-coordinate with its absolute value.

Absolute value graph

The given graph is the above graph shifted upward five units. The graph of any function \displaystyle y = f(x) shifted upward five units is \displaystyle y = f(x)+5, so the correct response is \displaystyle y = |x| + 5.

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