Answer:
129/500
Step-by-step explanation:
Decimal Fraction Percentage
0.258 129/500 25.8%
Step-by-step explanation:
First get x on its own:
Subtract 3 from each side
y - 3 = 2x
Divide through by 2
y/2 - 3/2 = x
or x = y/2 - 3/2
Now simply switch labels: x↔y
y = x/2 - 3/2
Step-by-step explanation:

2.
You will have on real root, and two complex which derives from the 3rd degree polynomial function.