Solve for D, F, E
D=-12
F=20
E=-9
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F=-4-2D
Solve 4+2D+F=0 for F.
100+10D-4-2D=0 16+4E-4-2D=0
Substitute -4-2D for F in the second and third equation.
D=-12 E=-3+\frac{1}{2}D
Solve these equations for D and E respectively.
E=-3+\frac{1}{2}\left(-12\right)
Substitute -12 for D in the equation E=-3+\frac{1}{2}D.
E=-9
Calculate E from E=-3+\frac{1}{2}\left(-12\right).
F=-4-2\left(-12\right)
Substitute -12 for D in the equation F=-4-2D.
F=20
Calculate F from F=-4-2\left(-12\right).
D=-12 F=20 E=-9
The system is now solved.
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