91Ó°ÊÓ

An equation is a mathematical statement that two expressions are equal. The solution of an equation is the value that when substituted for the variable makes the equation a true statement.

Example: 3x + 5 = 14 is an equation, in which 3x+5 and 14 are two expressions separated by an ‘’equal’’ sign.

Step 1: Simplify each side of the equation by removing parenthesis and combining the like terms.

Step 2: Use addition or subtraction to isolate the variable term on one side (preferably in the left side).

Step 3: Use Multiplication or Division to solve for the variable.

Now solving the equation$-  4  +  y  =  9 $with proper steps

$\begin{array}{l}−4+y=9\\ −4+4+y=9+4\left[\text{Add4tobothsides}\right]\\ y=13\end{array}$

Solution of the equation is $y=13$