\left\{ \begin{array} { l } { a = 4 } \\ { b = 5 } \\ { a - b = x } \end{array} \right.
Solve for a, b, x
x=-1
a=4
b=5
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4-5=x
Consider the third equation. Insert the known values of variables into the equation.
-1=x
Subtract 5 from 4 to get -1.
x=-1
Swap sides so that all variable terms are on the left hand side.
a=4 b=5 x=-1
The system is now solved.
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