Question

Tentukan hp dari 2x+2y=6 dan x-y=4

Answer 1

2x + 2y = 6 | x1
 x  - y = 4    | x 2

2x + 2y = 6
2x - 2y  = 8
-------------- -
       4y = -2
         y = -2 /4
         y = -1/2

x - y = 4
x - (-1/2) = 4
x + 1/2 = 4
   x      = 4 - 1/2
    x     = 3 1/2

HP = { 3 1/2 , - 1/2}

Answer 2

2x+2y=6|×1| 2x+2y=6
x-y=4|×2| 2x-2y=4
__________ -
0+4y=2
y=2/4
y=1/2

x-y=4
x-1/2=4
x=4+1/2
x=4 1/2

jadi hp = {4 1/2, 1/2}