How do you solve and check your solutions to #7.2y+4.7=62.3#?

Question

1604 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-04-25T15:21:06

#y=8#

Don't like decimals so lets get rid of them. Multiply (all of) both sides by 10 giving:

#72y+47=623#

Subtract 47 from both sides

#72y=576#

Divide both sides by 72

#y=8#
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Check: Given that the right hand side is 62.3 consider just the left hand side

#color(red)(7.2(8))color(blue)(+4.7)#

#color(red)(56+1.6)color(blue)(+4.7)#

#56.0#
#color(white)(0)1.6#
#ul(color(white)(0)4.7) larr" add"#
#62.3#

#LHS=RHS" for "y=8color(red)(" Thus true")#