Question

Penyelesaian sistem persamaan 3x - 5y = 31 dan y = -2x + 12 adalah

Answer 1

3x - 5y = 31
y = -2x + 12 >> 2x + y = 12

3x -5y = 31 > × 2 >> 6x - 10 y = 62
2x + y = 12 > × 3 >> 6x + 3y = 36
---------------- .............. ------------------- -

= -13 y = 26
= y = 26/-13
= y = -2

2x + y = 12
2x + (-2) = 12
2x = 12 +2
2x = 14
x = 14/2
x = 7