\left\{ \begin{array} { c } { 2 x + 3 y = 7 } \\ { 4 x - 3 y + z = - 2 } \\ { x - y + z = 1 } \end{array} \right.
Datrys ar gyfer x, y, z
x=\frac{5}{13}\approx 0.384615385
y = \frac{27}{13} = 2\frac{1}{13} \approx 2.076923077
z = \frac{35}{13} = 2\frac{9}{13} \approx 2.692307692
Rhannu
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4x-3y+z=-2 2x+3y=7 x-y+z=1
Newid trefn yr hafaliadau.
z=-4x+3y-2
Datrys 4x-3y+z=-2 ar gyfer z.
x-y-4x+3y-2=1
Amnewid -4x+3y-2 am z yn yr hafaliad x-y+z=1.
y=-\frac{2}{3}x+\frac{7}{3} x=\frac{2}{3}y-1
Datrys yr ail hafaliad ar gyfer y a'r trydydd hafaliad ar gyfer x.
x=\frac{2}{3}\left(-\frac{2}{3}x+\frac{7}{3}\right)-1
Amnewid -\frac{2}{3}x+\frac{7}{3} am y yn yr hafaliad x=\frac{2}{3}y-1.
x=\frac{5}{13}
Datrys x=\frac{2}{3}\left(-\frac{2}{3}x+\frac{7}{3}\right)-1 ar gyfer x.
y=-\frac{2}{3}\times \frac{5}{13}+\frac{7}{3}
Amnewid \frac{5}{13} am x yn yr hafaliad y=-\frac{2}{3}x+\frac{7}{3}.
y=\frac{27}{13}
Cyfrifo y o y=-\frac{2}{3}\times \frac{5}{13}+\frac{7}{3}.
z=-4\times \frac{5}{13}+3\times \frac{27}{13}-2
Amnewid \frac{27}{13} am y a \frac{5}{13} am x yn yr hafaliad z=-4x+3y-2.
z=\frac{35}{13}
Cyfrifo z o z=-4\times \frac{5}{13}+3\times \frac{27}{13}-2.
x=\frac{5}{13} y=\frac{27}{13} z=\frac{35}{13}
Mae’r system wedi’i datrys nawr.
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