The graph below shows a linear relationship. The points shown have whole-number coordinates. 9 8 7 6 5 -1 1 3 1 2 3 4 5 6 7 8 9 0 1 2 -3 4 5 -6 -7 8 9

Sandy is upgrading her internet service. fast internet charges $20 for installation and $52.45 per month. quick internet has free installation but charges $57.45 per month. part 1 out of 2 complete the equation that can be used to find the number of months after which the internet service would cost the same. use the variable x to represent the number of months of internet service purchased.