How do you evaluate -x+y given x=1/2 and y=-2/5?

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How do you evaluate -x+y given x=1/2 and y=-2/5?

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Answer 1 · 2016-11-09T13:47:03

$- \frac{9}{10}$ $-9/10$

Explanation:

Substitute $\frac{1}{}$ $1/$ for $x$ $x$ and $- \frac{2}{5}$ $-2/5$ in the given formula and then solve using mathematics:

$- x + y \Rightarrow - \frac{1}{2} + (- \frac{2}{5}) \Rightarrow - \frac{1}{2} - \frac{2}{5}$ $-x + y => -1/2 + (-2/5) => -1/2 - 2/5$

Next get each term in the formula over the same denominator by multiplying by the correct form of $1$ $1$ :

$- \frac{1}{2} - \frac{2}{5} \Rightarrow (\frac{5}{5}) (- \frac{1}{2}) - (\frac{2}{2}) (\frac{2}{5}) \Rightarrow - \frac{5}{10} - \frac{4}{10}$ $-1/2 - 2/5 => (5/5)(-1/2) - (2/2)(2/5) => -5/10 - 4/10$

Next add together the fractions, in this case adding together negative numbers:

$- \frac{5}{10} - \frac{4}{10} \Rightarrow - \frac{9}{10}$ $-5/10 - 4/10 => -9/10$

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How do you evaluate -x+y given x=1/2 and y=-2/5?

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