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03.08.2019 •
Mathematics
Alex created a map of his neighborhood using a scale of 1 inch= 2 blocks.if his street is 6 blocks long how long will it be on the map?
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Ответ:
2x + 8y = –36 (2)
2*(1); 6X - 8Y = 52 (3)
(2)+(3); 8X = 16
then X= 2
from (1) when x= 2; 3(2) - 4y = 26
6 - 4y = 26
- 4y = 20
then y = -5
so the answer is B (2, -5)