ellie4678
08.01.2020 •
Mathematics
If the measures of the area and circumference of a circle have the same numerical value, what is the radius of the circle and why
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Ответ:
Ответ:
5x + 6y = 9 (2)
(1) x 5 : 10x + 40y = -10 (1a)
(2) x 2 : 10x + 12y = 18 (2a)
(1a) - (2a) : 28y = -28
y = -1
Substitute y = -1 into (1)
2x + 8(-1) = –2
2x - 8 = -2
2x = 6
x = 3
Answer : (3, -1) (Answer A)