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

1 Answer
Jan 15, 2017

See full solution process below:

Explanation:

To solve add $\textcolor{red}{0.4}$ to each side of the equation to solve for $x$ and keep the equation balanced:

$b - 0.4 + \textcolor{red}{0.4} = 3.1 + \textcolor{red}{0.4}$

$b - 0 = 3.5$

$b = 3.5$

To check, substitute $\textcolor{red}{3.5}$ back into the equation for $\textcolor{red}{b}$ and calculate the left side of the equation and ensure it equals 3.1.

$\textcolor{red}{b} - 0.4 = 3.1$

$\textcolor{red}{3.5} - 0.4 = 3.1$

$3.1 = 3.1$