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Makovka662 [10]
3 years ago
14

What is the y-coordinate of the solution to this system of equations? 5x-8y=1 3x+6y=-21

Mathematics
1 answer:
Vanyuwa [196]3 years ago
6 0

5x-8y=1...(1)
3x+6y=-21...(2)

(1)*3:
15x-24y=3...(3)

(2)*5:
15x+30y=-105...(2)

(3)-(2):
15x-24y-(15x+30y)=3-(-105)
15x-24y-15x-30y=108
-54y=108
y=-2
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