A+b-c = 4 a+2b+2c = -2 b-2c = 7-2a Ditanyakan nilai 2C = .... Question from @fathangtw

October 2018 2 140 Report

A+b-c = 4
a+2b+2c = -2
b-2c = 7-2a

Ditanyakan nilai 2C = ....

izharulhaq78 $\displaystyle a+b-c=4\\a+b-4=c\\\\a+2b+2c=-2\\a+2b+2(a+b-4)=-2\\a+2b+2a+2b-8=-2\\3a+4b=-2+8\\3a+4b=6\\\\b-2c=7-2a\\b-2(a+b-8)=7-2a\\b-2a-2b+16=7-2a\\16-7=-2a+2a+b\\9=b\\3a+4b=6\\3a+4(9)=6\\3a+36=6\\3a=6-36\\3a=-30\\a=-10\\\\a+b-4=c\\-10+9-4=c\\-5=c\\\\2c=2\times(-5)\\\boxed{\boxed{2c=-10}}$

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fathangtw Terimakasih

fdsurya A + b - c = 4
a + 2b + 2c = -2
-------------------- -
-b - 3c = 6......;b = -3c-6
b - 2c = 7 - 2a
-------------------- +
-c = 13 - 2a;2a = c + 13......
(-3c - 6) -2c = 7 - (c + 13)
-5c - 6 = 20 - c
-4c = 26
c = -26/4 ★
2a = -26/4 + 52/4
2a = 26/4
a = 26/8 ★
b - 2 (-26/4) = 7 - 2 (26/8)
b + 26/2 = 28/4 - 26/4
b = 1/2 - 26/2
b = -25/2 ★

Maaf kalo salah :P

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fathangtw Terimakasih

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