Evaluate $3 x + 2 y - 4$ , if $x = 2$ and $y = (- 1)$ .

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Solution

$3 x + 2 y - 4$ at $x = 2 y = - 1$
is $3 (2) + 2 (- 1) - 4 = 6 - 2 - 4 = 0$

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