Question

maasah haiyun

tolong kasih tahu jawabannya terima kasih

-2x-y=4
3x+2y=9
f.) -x+2y= 5
3x-y=1

maasahhaiyun

Answer 1

ezra

e. - 2x - 2y = 4...1
3x + 2y = 9...2

- eliminasi y
- 2x - 2y = 4
3x + 2y = 9
____________+
x = 13

- subtitusi x = 13 ke persamaan 1
-2x - 2y = 4
-2(13) - 2y = 4
-26 - 2y = 4
- 2y = 4 + 26
-2y = 30
y = -15

f. -x + 2y = 5...1
3x - y = 1....2
- eliminasi y
-x + 2y = 5 | 1 | -x + 2y = 5
3x - y = 1 | 2 | 6x - 2y = 2
____________+
5x = 7
x = 7/5
x = 1,4
- subtitusi x = 1,4 ke persamaan 1
-x + 2y = 5
-(1,4) + 2y = 5
2y = 5 + 1,4
2y = 6,4
y = 3,2