Tentukan y dan x dari 4/x+2 + 1/y-3=8 dan 3/x+2 + 2/y-1=1
Jawab:
persamaan linier dua variabel
Penjelasan dengan langkah-langkah:
misalkan
1/(x+ 2) = a dan 1 /(y – 3) = b
4/(x + 2) + 1/(y-3) = 8 –> 4a + b = 8
3/(x + 2) + 2(y-3) = 1 –> 3a + 2b = 1
..
eliminasikan
4a + b = 8….kalikan 2
3a + 2b = 1 .kalikan 1
. . . .
8a + 2b = 16
3a + 2b = 1 ……(kurangkan)
. . .
5a = 15
a = 3
.
4a + b = 8 –> b = 8 – 4a
b = 8 – 4(3) = 8 -12
b = – 4
.
a = 3 –> 1/(x + 2) = 3
x + 2 = 1/3
x = 1/3 – 2 = – 5/3
.
b = – 4 –> 1/(y – 3) = b
y – 3 = – 1/4
y = 3 – 1/4
y = 11/4
.
(x,y ) = ( – 5/3 , 11/4 )