Datrys (12x+3y)-(12x-20y)=15-81

$$( 12 x + 3 y ) - ( 12 x - 20 y ) = 15 - 81$$

Datrys ar gyfer y

$$y = -\frac{66}{23} = -2\frac{20}{23} = -2.869565217391304$$

Camau ar gyfer Datrys Hafaliad Llinol

I ddod o hyd i wrthwyneb 12x-20y, dewch o hyd i wrthwyneb pob term.

$$12x+3y-12x+20y=15-81$$

Cyfuno 12x a -12x i gael 0.

$$3y+20y=15-81$$

Cyfuno 3y a 20y i gael 23y.

$$23y=15-81$$

Tynnu 81 o 15 i gael -66.

$$23y=-66$$

Rhannu’r ddwy ochr â 23.

$$y=\frac{-66}{23}$$

Gellir ailysgrifennu \frac{-66}{23} fel -\frac{66}{23} drwy echdynnu’r arwydd negatif.

$$y=-\frac{66}{23}$$

Datrys ar gyfer x (complex solution)

$$x\in \mathrm{C}$$

$$y = -\frac{66}{23} = -2\frac{20}{23} = -2.869565217391304$$

Datrys ar gyfer x

$$x\in \mathrm{R}$$

$$y = -\frac{66}{23} = -2\frac{20}{23} = -2.869565217391304$$