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

1 Answer
smendyka
Nov 9, 2016

#-9/10#

Explanation:

Substitute #1/# for #x# and #-2/5# in the given formula and then solve using mathematics:

#-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#:

#-1/2 - 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:

#-5/10 - 4/10 => -9/10#

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