Answer:
In the very first step, when they multiply both sides by 3 the -2y should become -6y but instead it stays as -2y. The correct solution would be:
9x - 6y =6
9x - 6y = 6
0 = 0
This means there are infinite solutions.
Since there is no quadratic function, there is no rate of change.
572 rounded to the nearest 10 is 570 and 572 rounded to nearest 100 is 600.