Precalculus Examples

$- 4 x - 5 y = - 22$ , $30 x + 39 y = 180$ , $15 x + 19 y = 85$

Step 1

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$- 4 x - 5 y = - 22, 30 x + 39 y = 180, 15 x + 19 y = 85$