Evaluate Using the Given Value -2xy-1 when y=-1

$- 2 x y - 1$ when $y = - 1$

Step 1

Replace the variable $y$ with $- 1$ in the expression.

$- 2 x \cdot - 1 - 1$

Step 2

Multiply $- 1$ by $- 2$ .

$2 x - 1$

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