Soory cant help to advanced
You do 3 times 14 and you get 42
Answer:

Step-by-step explanation:
Given Equations:
Equation:1
Equation:2
Solving Equation:2 for the value of 'y'

Subtracting '5x' both sides:
Equation:3
Using substitution method: Put the value of 'y' in equation:1


Subtracting '51' both sides:

Putting the value of 'x' in equation:3


The values of 'x' and 'y' are:

Definitely Graph C.
The dots are aligned correctly to the line better than the other graphs.
The 1st graph is the answer.