Write a linear equation to fit each situation.
1) A medical laboratory charges $30 for a consultation and an additional $10 per test. (Let t = the # of test, f(t) = the total fee.)
2) A 150 kg man goes on a diet and loses 1.4 kg/week. Relate weight to the number of weeks on the diet. (Identify variables as in #1.)
3) 2 hours into a trip by car is 600 miles from its desitnation, Chicago. The car travels at an average speed of 50 mph. (Let t = time in hours, d(t) = distance from Chicago)
d(t)=600-50t