How do you solve #y + (-3) = 7#?

1 Answer
Callum S.
Mar 30, 2016

10

Explanation:

When you add together a positive number and a negative number, the positive number, the positive and the negative cancel and become a negative.

Because of this #y+(-3)=7# becomes #y-3=7#
This can then be solved as a linear equation:
#y-3=7#
#y-3+3=7+3#
#y=7+3#

Therefore:
#y=10#

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