Someone please help me im so confused

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

It is given that the quadratic equation hx²-3x+k=0, where h and k are constants, has roots [tex] \beta \: and \: 2 \beta [/tex]express h in terms of k