batterup490 batterup490

08-03-2020
Mathematics

contestada

Given ƒ(x) = 3x + 9, find x when ƒ(x) = 21.

Respuesta :

sophia808 sophia808

08-03-2020

3x + 9 = 21
3x = 12
x = 4

Answer Link

amandapowller06 amandapowller06

08-04-2020

Answer:

4

Step-by-step explanation:

ƒ(x) = 3x + 9; Substitute 21 for ƒ(x).

21 = 3x + 9

21 − 9 = 3x

12 = 3x → x = 4

Answer Link

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