Solve the following system by any method. –3x + 5y = –9 4x + 8y = 12
–3x + 5y = –9 4x + 8y = 12 (–3x + 5y = –9) * (4) -12x + 20 = -36 (4x + 8y = 12) * (3) 12x + 24y = 36 (-12x + 20 = -36) + (12x + 24y = 36) 44y = 0 y = 0 –3x + 5(0) = –9 -3x = -9 x = -9/-3 x = 3 Solution set: (3, 0)
s
Asked 12/12/2017 12:39:25 PM
Updated 12/13/2017 9:04:17 AM
Edited by Masamune [12/13/2017 9:04:16 AM]
Rating
8
–3x + 5y = –9
4x + 8y = 12

(–3x + 5y = –9) * (4)
-12x + 20 = -36
(4x + 8y = 12) * (3)
12x + 24y = 36

(-12x + 20 = -36) + (12x + 24y = 36)
44y = 0
y = 0

–3x + 5(0) = –9
-3x = -9
x = -9/-3
x = 3

Solution set: (3, 0)
Added 12/13/2017 9:04:17 AM
This answer has been confirmed as correct and helpful.

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3 – (–3) + 7 – 4 =
Updated 12/12/2017 2:12:30 PM
3 – (–3) + 7 – 4
= 3 + 3 + 7 - 4
= 6 + 7 - 4
= 13 - 4
= 9
Added 12/12/2017 2:12:30 PM
This answer has been confirmed as correct and helpful.
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