Finite Math Examples

$5 x \cdot 1 - 2 x \cdot 2 = - 9$ , $15 x \cdot 1 - 6 x \cdot 2 = - 27$

Step 1

Replace all occurrences of $x$ with $- 9$ in each equation.

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Step 1.1

Replace all occurrences of $x$ in $3 x = - 27$ with $- 9$ .

$3 (- 9) = - 27$

$x = - 9$

Step 1.2

Simplify the left side.

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Step 1.2.1

Multiply $3$ by $- 9$ .

$- 27 = - 27$

$x = - 9$

$- 27 = - 27$

$x = - 9$

$- 27 = - 27$

$x = - 9$

Step 2

Remove any equations from the system that are always true.

$x = - 9$

Step 3