Subtitute 2x+y=7 and 3x-y=8
1 answer:
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not sure how the first two pictures apply here, since they're just a single circle.
check the picture below.
the one on the left can have 3 common tangent lines, the one on the right, only two common ones.
Answer:
40 hours will it take for the pool to fill.
Step-by-step explanation:
A pump can fill a swimming pool in 8 hours.
Work done by pump to fill in 1 hour is
The pool also has a drain that can empty the pool in 10 hours.
Work done by pump to drain in 1 hour is
If someone turns on the pump to fill the pool, but forgets to shut the drain.
Work done by both pipe in 1 hour is
Both pipe filled part of pool in hours = 1
Both pipe filled complete pool in hours =
Therefore, 40 hours will it take for the pool to fill.