SAT II Math Level 2 - how did you study for it?

pkutshnusntu
Sun, 26 May 2019 08:09:36 +0000

If the graph of is perpendicular to the graph of ax + 3y + 2= 0, then a =
(A) – 4.5
(B) –2.22
© –1.35
(D) 0.45
(E) 1.35

However i try, i found the answer to be E, but the answer of Barron is C, anyone could verify?