How do you solve #8=r-5#?

1 Answer
Alan P.
Oct 4, 2016

#color(green)(r=13)#

Explanation:

Given
#color(white)("XXX")8=r-5#

Remember that you can add the same amount to both sides of an equation and still maintain the validity of the equation.
#color(white)("XXX")8color(red)(+5)=r-5color(red)(+5)#
or
#color(white)("XXX")13 = r#

Also remember that #b=a# means #a=b#
So
#color(white)("XXX")13 = r# means #color(green)(r=13)#

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