SOLUTION: If (3,n) is a solution of Ax + 3y= 6 and (n,5) is a solution of 5x + y= 20, what is the value of A **linear equations**

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Question 999411: If (3,n) is a solution of Ax + 3y= 6 and (n,5) is a solution of 5x + y= 20, what is the value of A **linear equations**
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute with given values,
A%283%29%2B3%28n%29=6
3A%2B3n=6
A%2Bn=2
.
.
.
5%28n%29%2B5=20
5n%2B5=20
n%2B1=4
n=3
So then,
A%2B3=2
A=-1