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11-02-2021
Mathematics

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

Respuesta :

11-02-2021

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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