All three triangles are congruent by SAS
That is not correct. I will help you. Begin by subtracting the 9x from both sides, like this: 9x - 9x + 2y = 6 - 9x. That simplifies to 2y = -9x + 6. Now divide both sides by 2 to get y all alone, like this:

. That reduces down to

. That is slope-intercept form. y = mx + b.
It would be 96 because V=(9)(32)= 288/3=96
0.097- or it could be 0.10 if you round it