How do you solve #0.2a+9=11.4#?

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Answer 1 · 2017-06-06T09:26:43

#a = 12#

#0.2a + 9 = 11.4# => subtract 9 from both sides:
#0.2a = 2.4# => divide both sides by 0.2:
#a = 2.4/(2/10) = 24/2 = 12#

Answer 2 · 2017-06-06T10:10:35

A sort of cheat method. Not really!

#a=12#

Don't like decimals so lets get rid of them.

Multiply everything by 10 giving:

#2a+90=114#

Subtract 90 from both sides

#2a=24#

Divide both sides by 2

#a=12#