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supremekai
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Krunaal
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Is plugging in the only way? No doubt it is the easiest. I should've tried this when I was stuck.

Also how can we assume 3x + 4 = 7?
Krunaal
3x + 4 = 7
x = 1

when x = 1, g(3x + 4) = -5(1) = -5

Answer A.
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BelisariusTirto
Is plugging in the only way? No doubt it is the easiest. I should've tried this when I was stuck.

Also how can we assume 3x + 4 = 7?
Krunaal
3x + 4 = 7
x = 1

when x = 1, g(3x + 4) = -5(1) = -5

Answer A.
Since we are asked to find the value of g(7), and we know that g(3x + 4) = -5x, we simply substitute 7 for 3x + 4, in doing so we also get the value of x.
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