Pls help
If a varies jointly as b and c, find a when b = 4 and c = -3.
a = -96 when b = 3 and c = -8
a=
![Pls help If a varies jointly as b and c find a when b 4 and c 3 a 96 when b 3 and c 8 a class=](https://us-static.z-dn.net/files/d2d/40d2193dffdc7de87ae60363935a2fa2.png)