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Given the domain [tex]\{-2, 2, 4\}[/tex], what is the range for the relation [tex]3x + y = 3[/tex]?

A. [tex]\{0, 5, 7\}[/tex]
B. [tex]\{-3, 9, 15\}[/tex]
C. [tex]\{9, -3, -9\}[/tex]
D. [tex]\{-9, 3, 9\}[/tex]


Sagot :

To find the range given the domain [tex]\(\{-2, 2, 4\}\)[/tex] for the relation defined by the equation [tex]\(3x + y = 3\)[/tex], we will follow these steps:

1. Start with the equation:
[tex]\[ 3x + y = 3 \][/tex]

2. Solve for [tex]\(y\)[/tex]:
[tex]\[ y = 3 - 3x \][/tex]

3. Substitute each value from the domain into the equation to find the corresponding [tex]\(y\)[/tex] values:

- For [tex]\(x = -2\)[/tex]:
[tex]\[ y = 3 - 3(-2) = 3 + 6 = 9 \][/tex]

- For [tex]\(x = 2\)[/tex]:
[tex]\[ y = 3 - 3(2) = 3 - 6 = -3 \][/tex]

- For [tex]\(x = 4\)[/tex]:
[tex]\[ y = 3 - 3(4) = 3 - 12 = -9 \][/tex]

4. Combine the resultant [tex]\(y\)[/tex] values to form the range:
[tex]\[ \{9, -3, -9\} \][/tex]

Therefore, the correct answer is:
C. [tex]\(\{9, -3, -9\}\)[/tex]