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S_A_V [24]
3 years ago
14

What is the value of y in the solution to the system of equations?x y = 12x – 3y = –30

Mathematics
2 answers:
zhenek [66]3 years ago
8 0
X + y = 12 . . . . . . . . (1)
x - 3y = -30 . . . . . . . (2)
(1) - (2): 4y = 42
y = 10.5
arlik [135]3 years ago
4 0

Answer:

y=10.5

Step-by-step explanation:

we have

x+y=12 ------> equation A

x-3y=-30 ------> equation B

Multiply by -1 equation A

-1*(x+y)=-1*12 -------> -x-y=-12 ------> equation C

Adds equation B and equation C

x-3y=-30\\-x-y=-12\\ -----------\\-3y-y=-30-12\\-4y=-42\\y=42/4\\ y=10.5

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Step-by-step explanation:

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