Question 800879
To solve this question, you will need to substitute in the given (x,y) points in each of the equations to see which one satisfies all possible given points.

The (x,y) points are these:

(5, 6) (7, 12) (9, 18)

The first equation is y = 3x - 9

So, we will try each set of points.

Set 1:
{{{(6) = 3(5) - 9}}}
{{{6 = 15 - 9}}}
{{{6 = 6}}}

Set 2:
{{{(12) = 3(7) - 9}}}
{{{12 = 21 - 9}}}
{{{12 = 12}}}

Set 3:
{{{(18) = 3(9) - 9}}}
{{{18 = 27 - 9}}}
{{{18 = 18}}}

You could try the same thing for each of the other equations, but no other one satisfies these sets of points.  So the correct answer is choice A.