Answer:
The value of x is 7 and y is 14.
Step-by-step explanation:
The steps are :






The answer is D. They both had the same proportion.
Hope this helps!!!
The simplified answer is 
If you are dividing powers with like terms you subtract the denominator to the numerator.
Answer: 100 miles
Step-by-step explanation:
300+3x=500+1x
subtract 1 from both sides
300+2x=500
subtract 300 from both sides
2x=200
divide 2
x=100