How do you solve and check your solutions to #b-0.4=3.1#?

1 Answer
smendyka
Jan 15, 2017

See full solution process below:

Explanation:

To solve add #color(red)(0.4)# to each side of the equation to solve for #x# and keep the equation balanced:

#b - 0.4 + color(red)(0.4) = 3.1 + color(red)(0.4)#

#b - 0 = 3.5#

#b = 3.5#

To check, substitute #color(red)(3.5)# back into the equation for #color(red)(b)# and calculate the left side of the equation and ensure it equals 3.1.

#color(red)(b) - 0.4 = 3.1#

#color(red)(3.5) - 0.4 = 3.1#

#3.1 = 3.1#

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