tentukan hinpunan penyelesaian dari sistem persamaan berikut dengan cara eliminasi! a. 3x+2y= 10 dan 3x+5y=16. b.4x+5y=7 dan 6x-10y= 28 c. 8x-7y+2=0 dan 8x+7y=1

a. 3x+2y = 10|3| 9x+6y = 30
3x+5y = 16|3| 9x+15y= 48 _ (dikurang)
-9y = -18
y = 2
3x+2y = 10
3x+4 = 10
3x = 6
x = 2


b. 4x+5y = 7|6| 24x+30y = 42
6x-10y =28|4| 24x- 40y = 112 _ (dikurang)
70y = 42
y = 3/5
4x+5y = 7
4x+5(3/5)=7
4x+3 = 7
4x = 4
x = 1


c. 8x-7y = -2|7 | 56x-49y = -14
8x+7y= 15|-7| -56x-49y = -105 _ (dikurang)
112x = 91
x = 13/16
8x+7y = 15
8(13/16)+7y=15
13/2+7y = 15
7y = 15-13/2
7y = 30/2-13/2
7y = 17/2
y = 17/14