Gunakan metode eliminasi,tentukan penyelesaian dari SPLDV berikut. a. x+2y=-2 3x-y=10 b. x+3y=7 x+y=3 c. x-y=1 x-2y=3
adamhubert
A. x + 2y = -2 |x3| 3x - y = 10 jadi: 3x + 6y = -6 3x - y = 10 ---> 7y = - 16 y = - 2.28 subsitusikan : x + 2y = -2 x + 2(-2.28) = -2 x + 4.56 = -2 x = -4.56 - 2 x = -6.56 b. x + 3y = 7 x + y = 3 ---> 2y = 4 y = 2 subsitusikan : x + y = 3 x + 2 = 3 x = 1 c. x - y = 1 x - 2y = 3 -----> y = -2 subsitusikan : x - y = 1 x - (-2) = 1 x + 2 = 1 x = -1
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3x - y = 10
jadi: 3x + 6y = -6
3x - y = 10
---> 7y = - 16
y = - 2.28
subsitusikan : x + 2y = -2
x + 2(-2.28) = -2
x + 4.56 = -2
x = -4.56 - 2
x = -6.56
b. x + 3y = 7
x + y = 3
---> 2y = 4
y = 2
subsitusikan : x + y = 3
x + 2 = 3
x = 1
c. x - y = 1
x - 2y = 3
-----> y = -2
subsitusikan : x - y = 1
x - (-2) = 1
x + 2 = 1
x = -1
Jangan lupa visit blog aku ya :) di : pleonora.blogspot.com