Hello!
In a really simple way, 3 times our answer is 19. We can just divide to find it.
19/3= 6 1/3
Anyway, it might be nice to solve the equation for b. If a=6, then b has to be 1/3, but let's check.
18+3b=19
3b=1
b=1/3
Therefore, a+b= 6 1/3
I hope this helps!
The perimeter is twice the sum of the length and the width:

The area is the product of the dimensions:

So, the system is

Answer:
B
Step-by-step explanation:
I got this answer correct on a test