Question

Cara eliminasi x+y=-3 dengan y=2x+12

Answer 1

X + y = -3
-2x + y = 12
------------------- - 
3x = -9
x = -3

x + y = -3    (dikali -2)
-2x + y = 12 (dikali 1)
---------------------------------
-2x - 2y = 6
-2x + y = 12
---------------------- -
-3y = -6
y =2

Answer 2

X + y = -3
y = 2x + 12 diubah menjadi -2x + y = 12 / 2x -y = -12

x +y = -3
2x + y = -12
----------- -
-x = 9
x = -9


x +y = -3.
-9 + y = -3
y = -3 +9
y = 6