Selesaikan sistem persamaan berikut dengan metode gabungan.
a.148x+231y=610
231x+148=527
b.217x+131y=827
217y+131x=913
c.23x-29y=68
29x-23y=140
d.5x+3y=47
3x+5y=57
a.148x+231y=610
231x+148=527
b.217x+131y=827
217y+131x=913
c.23x-29y=68
29x-23y=140
d.5x+3y=47
3x+5y=57
3x + 5y = 57 | *5
============
15x + 9y = 141
15x + 25y = 285
------------------------ -
-16y = -144
y = -144/-16
y = 9
y = 9 -> 5x + 3y = 47
5x + 3.9 = 47
5x = 47 - 27
x = 20/5
x = 4
* jadi x = 4, y = 9