322251
18.03.2020 •
Mathematics
An engineer drew the graph of a new tire on a coordinate plane. The equation of the tire was x^2+y^2-26y=0. How many feet will the tire roll in 100 complete revolutions. If necessary, round your calculations to the nearest hundredths, and your final answer to the nearest whole number. Complete the explanation (look at picture)
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Ответ:
2x+y=1 (1)
9x + 3y = -3(2)
by (1) : y = -2x+1...(*)
by (2) : 3(3x+y) = - 3
3x+y = -1
y = -3x -1 (**)
by (*) (**) :
-2x+1 = -3x -1
- 2x +3x = -1 -1
x =-2 is The x-coordinate of the point of intersection