How do you solve 8=r-5?

1 Answer
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)