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x + 3y = 16 ... (2)
Ditanya = 4x - y = ?
Jawab = 7x - y = 2
7x - 2 = y
y = 7x - 2 ...(3)
Subtitusikan persamaan (3) ke persamaan (2)
x + 3y = 16
x + 3 (7x - 2) = 16
x + 21x - 6 = 16
22x = 16 + 6
22x = 22
x = 1 ...(4)
Subtitusikan persamaan (4) ke persamaan (3)
y = 7x -2
y = 7 (1) -2
y = 7 - 2
y= 5
4x - y = 4(1) - 5
= 4 - 5 = -1
Jadi nilai dari 4x - y adalah -1
x+3y=16 /x1
=21x-3y=6
x+3y=16
____________+
=22x =22
x=1
x+3y=16
1+3y=16
3y=15
y=5
4x-y
4(1)-5= 4-5= -1