Answer:
60 degrees Fahrenheit
Step-by-step explanation:
The formula you would need to use:
(20°C × 9/5) + 32 = 68°F
So firstly, subtract x on both sides: 
Next, divide -2 on both sides, and your answer will be y = 1/2x - 3/2 , or the last option.
All you have to do here is some simplifying.
6/12 = what
6 divided by 12 = 1/2
1/2 = 2/4
There! We have our missing value
6/12 = 2/4
Answer: c = 4
The answer is X=23 and y=9