Question

Guys please bantuannya no 10,12,14 sm 16 pake cara menggunakan metode eliminasi.Kalau ngga tau jangan jawab.Terima kasih

Answer 1

No.10.
5x-3y=0 |x2| 10x-6y=0
5x-3y=0 |x4| 20x-12y=0
2x+4y+26=0 |x5| 10x+20y=-130
2x+4y+26=0 |x3| 6x+12y=-78

10x-6y=0
10x+20y=-130
--------------------- (—)
-26y=130
y=-5

20x-12y=0
6x+12y=-78
-------------------- (+)
26x=-78
x=3

no.12
3x=2y |x4| 12x-8y=0
3x=2y |x3| 9x-6y=0
3y=4x+1 |x3| 12x-9y=-3
3y=4x+1 |x2| 8x-6y=-2

12x-8y=0
12x-9y=-3
---------------(-)
y=3

9x-6y=0
8x-6y=-2
---------------(-)
x=2

no.14
-2x+4y=-6 |x3| -6x+12y=-18
-2x+4y=-6
3x+2y=0 |x2| 6x+4y=0
3x+2y=0 |x2| 6x+4y=0

-6x+12y=-18
6x+4y=0
----------------(+)
16y=-18
y=-9/8

-2x+4y=-6
6x+4y=0
---------------(-)
-8x=-6
x=3/4

no.16
4x=5y+13 |x5| 20x-25y=65
4x=5y+13 |x3| 12x-15y=39
3y=7-5x |x4| 20x+12y=28
3y=7-5x |x5| 25x+15y=35

20x-25y=65
20x+12y=28
--------------------(-)
37y=37
y=1

12x-15y=39
25x+15y=35
-----------------(+)
37x=74
x=2