Solve for A, B, C, D
A=12
B=42
C=-1014
D=-1068
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12+42=-1014-D
Consider the first equation. Insert the known values of variables into the equation.
54=-1014-D
Add 12 and 42 to get 54.
-1014-D=54
Swap sides so that all variable terms are on the left hand side.
-D=54+1014
Add 1014 to both sides.
-D=1068
Add 54 and 1014 to get 1068.
D=-1068
Divide both sides by -1.
A=12 B=42 C=-1014 D=-1068
The system is now solved.
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