(1.25, 2.5) and (3.75, 7.5) do these points represent a proportional relationship

Solve for x where 0 equation: cot^2x+2cotx+1=0

Which of the following is another way to express the difference between -5 and 8?

The graph below represents which system of inequalities? a. y< -2x+6 y< (or equal to) x+2 b. y< (or equal to) -2x+6 y c. y< 2/3 x - 2 y> (or equal to) 2x +2 d. none of the above