9x+3y=12 how can this function be written using function notion

What is the answer to this problem 7 * 5/6

Anne is twice as old as bill, and bill is 3 years older than christie. the sum of anne s and christie s ages equal 72. find their age difference.?

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m