The first option :
Multiply the first equation by 8 and the second equation by 2
would not result in the elimination of the variables in this system
If it is 1 2/3 it is 5/3. if it is 12/3 it is already a improper factor.<span />
Answer:
<h3 />
Step-by-step explanation:
That looks hard
3800000+800000+1000+400+40
Answer:
60 m/h
Step-by-step explanation:
1. the basic formula is Time=Distance/Speed;
2. total time is time1 (for 84 miles)+time2 (for 130 miles)=time (4 hours);
3. the time for the first 84 mi. is time1=84/S;
4. the time for the rest 130 mi. is time2=130/(S-10);
5. using all the data of items 2-4, it is possible to substitute into the basic formula and resolve an equation:


note, that the value of speed has one condition: s>10. It means, the only value is true: 60 miles per hour.