How do you find 4x − 2y if x = −1 and y = −4?

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How do you find 4x − 2y if x = −1 and y = −4?

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Answer 1 · 2016-01-31T21:40:07

4

Explanation:

substitute the values into the expression.

$4 x - 2 y = 4 \times (- 1) - 2 \times (- 4) = - 4 + 8 = 4$ $4x - 2y = 4 xx (-1) - 2 xx (-4) = - 4 + 8 = 4$

Answer 2 · 2016-02-01T02:49:23

If we start with $4 x - 2 y$ $4x-2y$ , we just replace the $x$ $x$ with $- 1$ $-1$ and $y$ $y$ with $4$ $4$ , the expression becomes $4 (- 1) - 2 (- 4)$ $4(-1)-2(-4)$ . $4 \cdot - 1$ $4*-1$ becomes $color(white()$ $- 4$ $-4$ , and $- 2 \cdot - 4$ $-2*-4$ becomes 8. Together, $4 (- 1) - 2 (- 4)$ $4(-1)-2(-4)$ simplifies to $- 4 + 8$ $-4+8$ , which equals $4$ $4$ .

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How do you find 4x − 2y if x = −1 and y = −4?

2 Answers

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