Q8. - Algebra 1

Question

Solve each equation or formula for the variable specified.  

 

$x=3y-9$, for y

Step-by-Step Solution

Answer

The required equation is represented by $y=\frac{x+9}{3}$.

Step 1. Determine the method that can be used.

Isolation of y on any side of the equation will represent the required equation and to get this, perform some operations on the provided equation.

Step 2. Take the help of the obtained method.

Perform addition of 9 on both sides of the provided equation.

 

$$\begin{gathered} x+9=3y-9+9 \\ x+9=3y \end{gathered}$$

 

Perform division of 3 on both sides of the obtained equation.

$\begin{array}{l}\frac{x+9}{3}=\frac{3y}{3}\\ \frac{x+9}{3}=y\end{array}$

Step 3. Write the conclusion.

The obtained is $y=\frac{x+9}{3}$ so it is required equation.