6. Choose the correct answer. Which equation represents the quadratic function with the vertex (9, -7) and the point (6, -1)? O y = CO/ N (2 - 9)2 - 7 O y= 2 3 - (2 - 9) 2 + 7 O u= CO / N (2 - 9)2 - 7 O y = (2 + 9) 2 - 7 W 7. Choose the correct answer. What is the value of a for a quadratic function written in vertex form, y = a(x - h) + k, given the vertex (-2, -6) and the point (2, 2)? O O 2 O 4