Points a and a' have symmetry with respect to the line y = 3. a is point (2, 5). what is point a'?

How do you use the elimination method for this question? explain, because i really want to understand!

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Write each of the following numerals in base 10. for base twelve, t and e represent the face values ten and eleven, respectively. 114 base 5 89t base 12