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JcAlmighty
The answer is y = 2x + 3.

x - Kay's age
y - Jane's age
m - Mary's age

Jane is 3 years older than Mary: y = m + 3
Mary is twice as old as Kay: m = 2x

y = m + 3
m = 2x

Substitute m in the first equation:
y = 2x + 3

Answer:

2x +3 years old is Jane

Step-by-step explanation:

As per the statement:

If Kay is x years old.

Mary is twice as old as Kay.

then;

Mary = 2x  years old

It is also given that Jane is 3 years older than mary

⇒ Jane = 2x + 3

Therefore, 2x +3 years old is Jane

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