Diketahui 4x + 7y = 2 dan 3x + 2y = -5. Nilai dari 2x –3y adalah
A. -12
B. -1
C. 0
D. 13
A. -12
B. -1
C. 0
D. 13
4x + 7y = 2 | × 3 |
3x + 2y = - 5 | × 4 |
12x + 21y = 6
12x + 8y = - 20
______________ -
13y = 26
y = 2
4x + 7y = 2
4x + 7(2) = 2
4x + 14 = 2
4x = - 12
x = - 3
2x - 3y
= 2 ( - 3 ) - 3 ( 2 )
= - 6 - 6
= - 12
Penjelasan dengan langkah-langkah:
4x + 7y = 2 --> x 3
3x + 2y = -5 --> x 4
12x + 21y = 6
12x + 8y = -20
----------------------- -
13 y = 26
y = 2
4x + 7y = 2
4x + 7 ( 2 ) = 2
4x + 14 = 2
4x = 2 - 14
4x = -12
x = -3
nilai dari 2x +3y = 2 ( -3 ) + 3 ( 2 ) = -6 + 6 = 0
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