Datrys {l}{c-2n+2y=200}{n-y=400}{y=150}

$$\left\{ \begin{array}{l}{ c - 2 n + 2 y = 200 }\\{ n - y = 400 }\\{ y = 150 }\end{array} \right.$$

Datrys ar gyfer c, n, y

$$y=150$$

$$c=1000$$

$$n=550$$

Camau Ateb

Ystyriwch yr ail hafaliad. Mewnosod y gwerthoedd sy’n hysbys i’r hafaliad.

$$n-150=400$$

Ychwanegu 150 at y ddwy ochr.

$$n=400+150$$

Adio 400 a 150 i gael 550.

$$n=550$$

Ystyriwch yr hafaliad cyntaf. Mewnosod y gwerthoedd sy’n hysbys i’r hafaliad.

$$c-2\times 550+2\times 150=200$$

Gwnewch y gwaith lluosi.

$$c-1100+300=200$$

Adio -1100 a 300 i gael -800.

$$c-800=200$$

Ychwanegu 800 at y ddwy ochr.

$$c=200+800$$

Adio 200 a 800 i gael 1000.

$$c=1000$$

Mae’r system wedi’i datrys nawr.

$$c=1000 n=550 y=150$$