Please solve this simultaneous equation, i'm not that good at it.
2r-s=10
rs-s^2=12
1 answer:
Answer:
s = 6, r = 8 or s = 4, r = 7
Step-by-step explanation:
2r - s = 10
2r = 10 + s
r = 5 + s/2 --(1)
rs - s^2 = 12 --(2)
sub (1) into (2):
(5 + s/2)s - s^2 = 12
5s + 0.5s^2 - s^2 = 12
-0.5s^2 + 5s - 12 = 0
s^2 - 10s + 24 = 0
(s - 6)(s - 4) = 0
therefore s = 6 or s = 4
when s = 6, r = 8 and when s = 4, r = 7
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Answer: 5 1/2 hours
Step-by-step explanation:
1 hour = 12 miles
2 hours = 24 miles
3 hours =36 miles
4 hours = 48 miles
5 hours = 60 miles
6 hours = 72 miles
66- 60 = 6. 6 is half of 12.
In conclusion, it will take Tavyon 5 1/2 (or 5.5) hours to bike 66 miles.
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They just added 100 each time so i think the answer is b