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-2x+3y = 16 | ×4
9x + 12y = 21
-8x+ 12y = 64
__________ -
17x = -43
x =
soal salah
-2x + 3y = 16 (kali 3) -6x + 9y = 48
-------------------- +
17y = 62
y = 62/17
masukan nilai y :
3x + 4(62/17) = 7
3x + 248/17 = 7
3x = 7 - 248/17
3x = -129/17
x = (-129/17)(1/3)
x = -43/17
Maka :
2x - 7y
= 2(-43/17) - 7(62/17)
= -86/17 - 434/17
= -520/17
Semoga membantu :)