Question

Dengan metode eliminasi ,tentujan nilai x dan y dari
A. X+y=2
X+y=8
B.2x-3y=6
X-y=1
C.x-2y=5
X+y=11
D. 3x +2y=5
4x+3y=6
Tolong ya..secepat ny.mau d kmpul pahi ini

Answer 1

A. x+y=2 dan x+y=8 ini gak salah ketik atau apa gitu?
b. 2x-3y=6
2(1+y)-3y=6
2+2y-3y=6
-y=4 =>y=-4

x-y=1 =>x-(-4)=1 =>x=1-4=-3

c x-2y=5
11-y-2y=5
-3y=5-11
y=-6/-3=2

x+y=11
x + 2 = 11
x = 11 - 2 = 9

d. 3x+2y=5 |x4|
4x+3y=6 |x3|
=> 12x+8y=20
12x+9y=18 (dikurangkan)
=> -y= 2 => y=-2

3x+2y=5
3x+2(-2)=5
3x=5+4
x=9/3=3

Answer 2

A.
x+y = 2
x+y = 8
______ -
-6
x = 0 dan y = 0

B.
2x-3y = 6 | dikali 1
x-y = 1 | dikali 2

2x - 3y = 6
2x - 2y = 2
_________-
-y = 3
y = -3

2x - 3.(-3) = 6
2x + 9 = 6
2x = 6-9
x = -3/2

C.
x-2y = 5
x+y = 11
_______-
-3y = -6
y = 3

x - 2 . 3 = 5
x - 6 = 5
x = 5 + 6 = 11

D.
3x+2y = 5 | dikali 4
4x+3y = 6 | dikali 3

12x + 8y = 20
12x + 9y = 18
___________-
-y = 2
y = -2

3x + 2 . (-2) = 5
3x - 4 = 5
3x = 5+4
x = 9/3
x = 3