It’s A
Explanation / when you multiply 7 by -9 you get -63

We know that, in ∆ABC,
∠A+∠B+∠C = 180°
But the triangle is right angled at C
ie., ∠C = 90°
Therefore, ∠A+∠B+ 90° = 180°
⇒ ∠A + ∠B = 90°
Therefore, <u>cos(A + B) = cos 90º = 0</u>
I think the answer is C because AB is not a transversal
What do u need help w
its y=2/3x - 5