hendrisyafa
C. buat pemisalan misal = a = b sehingga persamaan menjadi 4a + 3b = 11 I x3 I 12a+9b = 33 3a - 4b = 2 I x4 I 12a- 16b = 8 ------------------- - 25 a = 25 a = 1 3(1) - 4b = 2 4b = 3-2 b =
a= 1 = = 1 x = 1
b =
y = 2
Hp x = 1 , y = 2
d. -------------------------------------------------------- x 4 x+1 - 2(y-2) = 24 x+1- 2y+4 = 24 x-2y = 19 pers (1)
misal = a
= b
sehingga persamaan menjadi
4a + 3b = 11 I x3 I 12a+9b = 33
3a - 4b = 2 I x4 I 12a- 16b = 8
------------------- -
25 a = 25
a = 1
3(1) - 4b = 2
4b = 3-2
b =
a=
1 =
= 1
x = 1
b =
y = 2
Hp x = 1 , y = 2
d.
-------------------------------------------------------- x 4
x+1 - 2(y-2) = 24
x+1- 2y+4 = 24
x-2y = 19 pers (1)
--------------------------------------------------------- x 6
2 (2x-2) + 3y-1 = 42
4x -4+3y-1 = 42
4x+3y = 47 pers (2)
pers (1) x-2y = 19 Ix4I 4x-8y = 76
pers (2) 4x+3y=47 Ix1I 4x+3y = 47
------------------ -
-11y = 29
y = -
e. misal a =
b =
pers menjadi
a - b = 6 I x1
2a + b = 4 Ix2
a - b = 6
4a+b = 8
---------------- +
5a = 14
a =
- b = 6
----------------------------------------- x 5
14 - 5b = 30
5b = -16
b =
a =
14x+42= 5
14x = -37
x =
b =
-16y-16 = 5
16y = -21
y =