Answer: The predicted value for Y When x = 4 is 33. ( y=33)
Explanation:
Hi, to answer this question we have to analyze the information given: 
y = 6x + 9 
Predict a value for y when x = 4 
To predict the value we have to substitute the variable "x" for the number 4. 
Mathematically speaking: 
y = 6(4) +9 
Solving: 
Y = 24 +9 
y = 33 
The predicted value for Y When x = 4 is 33. 
Feel free to ask for more if it´s necessary or if you did not understand something.