9x + 3 = 7x +19
2x + 3 = 19
2x = 16
x = 8
So, x (8) is the number of chairs in each row with these setups.
Plug 8 into one of the equations and you will find how many chairs total there are.
9(8) + 3 = 75
There are 75 chairs total
Estimation would give you an answer close to the actual answer so you can see if your answer is reasonable depending on how close the estimate is
D is true!!
Hope this helped:)
Answer:
the third one
Step-by-step explanation:
