Number 6 is A the slope of the graph is -1 and the starting point is seven, so that means your equation is y = -1x +7, it can also be written as y=-x+7
Number 7 is C if I’m not mistaken, because as the absent goes up the dots for grade point average goes down
Number 8 is A, because as more missing assignments goes up your grade will go down meaning it will be negative