Answer:
19
Step-by-step explanation:
Distributive property: 10x - 5 = 6
Add 5
10x = 11
Divide both sides by 10
x = 1.1
The linear relationship should be
AGE
16 ,17 ,18 ,19 ,20
162,171,180,189,198
WEIGHT
His weight should be going up 9 pounds per birthday
I will be glad to help you in the comments. I do need to know though, what is the class this is presented in? Is this algebra, or calculus? Depending on the class, we have different approaches.