Final answer:
To find x when y = 20, substitute y with 20 in the equation g(x) = 3x + 8 and solve for x.
Step-by-step explanation:
The equation given is g(x) = 3x + 8. We need to find the value of x when y = 20. To do this, we substitute y with 20 in the equation and solve for x.
20 = 3x + 8
Subtract 8 from both sides to isolate the term with x: 20 - 8 = 3x
Now, simplify the equation: 12 = 3x
Finally, divide both sides by 3 to solve for x: 12/3 = x
Therefore, x = 4.