Which rotational direction would move the point (0,9) to (-9,0) by a rotation of 90 degrees

With this question! what is process of elimination? ? p.s. my brothers acc got banned so add his new one @ yamauchiyamyam17

Use the discriminant to describe the roots of each equation. then select the best description. 2m2 + 3 = m double root real and rational roots real and irrational roots non-real roots

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x