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

1 Answer
smendyka
Jan 15, 2017

See full solution process below:

Explanation:

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

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

b - 0 = 3.5b−0=3.5

b = 3.5b=3.5

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

color(red)(b) - 0.4 = 3.1b−0.4=3.1

color(red)(3.5) - 0.4 = 3.13.5−0.4=3.1

3.1 = 3.13.1=3.1

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