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Untuk itu:
Dengan skalar dapat dihitung setelah perkalian matriks, berlaku:
Akan didapat:
Sehingga:
2x + 5y
= 2(1) + 5(2)
= 12
-2x +3y = 4
D = ((7x3 - (-2x-4)) = 21-8= 13
DX= ((-1x3 - 4(-4)) = -3 +16 = 13
DY=((7x4 - (-2)(-1)) = 28 -2 = 26
X = DX/D= 1
y = Dy/D= 2
nilai 2x +5y = 2+10 = 12