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What is the value of the function y = 18x − 13 when x = − 4?

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When x = -4, we can substitute it in the function:
y = 18x - 13
y = 18(-4) - 13
y = -72 - 13
y = -85

Therefore, the value of the function y = 18x - 13 when x = -4 is -85.

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