Himpunan penyelesaian dari persamaan 2x - y = -10 dan 5x + y = - 11 adalah… *
A.{(3,4)}
b.{(3, -4)}
c.{(-3,4)}
d.{(-3,-4)}
A.{(3,4)}
b.{(3, -4)}
c.{(-3,4)}
d.{(-3,-4)}
Jawaban:
2x - y = -10
5x + y = -11
--------------- +
7x = -21
x = -21/7
x = -3
2x - y = -10
2 (-3) - y = -10
-6 - y = -10
-y = -10 + 6
-y = -4
y = 4
HP x , y = { -3 , 4 }
OPSI C
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