Points I don't need them anymore

For the equations below which statement is true ? -2x=14 6x=-42

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. how many hours after the truck's departure will the two meet?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).