tentukan himpunan penyelesaian dari persamaan 2x - 3y = -13 dan x ± 2y = 4

2x - 3y = -13
x + 2y = 4
= 2x - 3y = -13
-2x - 2 × 2y = -2 × 4
= 2x - 3y = -13
-2x - 4y = -8
= 2x - 3y - 2x - 4y = -13 - 8
= -7y = -21
= -7y : ( -7 ) = -21 : ( -7 )
= y = 21 : 7
= y = 3
= x + 2 × 3 = 4
= x + 6 = 4
= x = 4 - 6
= x = -2
= ( x , y )=( -2 , 3 )
= 2 × ( -2 ) - 3 × 3 = - 13
-2 + 2 × 3 = 4
= -13 = -13
4 = 4
= ( x , y )=( -2 , 3 )



semoga anda puas ☺