Let g(y) = p*y^2 + q*y + r, where p,q,r are constants, p not equal to 0, and 3*g(8) = -4*g(2). The roots of g(y)=0 are 6 and m. Find m. Please explain the solution.

1) -0.8
2) -1.6
3) -2.4
4) -3.2
5) Cannot be determined.