write standard form

Answer:
1: a=4 b=3 c= -7
2: a=5 b= -9 c=7
3: a=1 b=6 c= 10
4: a=3 b= 16 c=12 not sure sa "b"
Step-by-step explanation:
maya kona po tutuloy yung iba may assignment din po ako hehe