Which equation? Sorry I don’t see one
Answer:
a.) 0.83
Step-by-step explanation:

We know that y=7x, so we just need tu put it into the 1st equation

So we found x. Now we can find y

Answer:
x=1, y=7; or (1;7)
12%*14000*3
Which is 5040
Therefore, it will have to pay back $4050
Answer: scroll down to find out :)
Step-by-step explanation:
This isn't a hard equation, so I would just use the points and figure something out.
Some obvious points are (3, 6), (6, 12), and (7, 14). Immediately, we notice that the y coordinate is 2 times the x coordinate.
So, the equation would be y = 2x.
<em>P.S. Let me know if I got it wrong! I'll be more than happy to fix it :)</em>