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Question

Choose the mapping diagram that represents the function given below.

y=2x+3, where x{1,2,3}

A
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C
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Solution

The correct option is C
The given function is y=2x+3.

Let us find the values of y when x=1,2, and 3.

x=1y=2(1)+3=2+3=5

x=2y=2(2)+3=4+3=7

x=3y=2(3)+3=6+3=9

We can express the function as the set of ordered pairs (1,5),(2,7),(3,9).

The mapping diagram that represents this function is:


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