fji fji
  • 20-03-2017
  • Mathematics
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Write and solve a system of equations for this question please

Write and solve a system of equations for this question please class=

Respuesta :

irspow
irspow irspow
  • 26-03-2017
Let b and s be the velocity of the boat and stream respectively....

3(b-s)=27

b-s=9

b=9+s  we will use this in the second equation....

2(b+s)=30

b+s=15, now use b found above in this to get:

9+s+s=15

2s+9=15

2s=6

s=3, and since from earlier b-s=9, b=9+s so

b=12

So the speed of the boat is 12mph and the stream is 3 mph
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