Chapter 2: Q23. (page 87)

Solve the equation using mental math.
$- 4 + y = 9$

Short Answer

Expert verified

The solution of the equation is y = 13

Step by step solution

Apply the concept of equation:

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.

What are the steps to solve an equation?

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.

Step 3: Solve the equation using mental math. - 4 + y = 9

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

$\begin{array}{l} - 4 + y = 9 \\ - 4 + 4 + y = 9 + 4 [Add4tobothsides] \\ y = 13 \end{array}$

Solution of the equation is $y = 13$

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Solve the equation using mental math.
$- 4 + y = 9$

Short Answer

Step by step solution

Apply the concept of equation:

What are the steps to solve an equation?

Step 3: Solve the equation using mental math. - 4 + y = 9

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Solve the equation using mental math.- 4 + y =9

Short Answer

Step by step solution

Apply the concept of equation:

What are the steps to solve an equation?

Step 3: Solve the equation using mental math. - 4 + y = 9

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Probability and Statistics

Decision Maths

Mechanics Maths

Calculus

Theoretical and Mathematical Physics

Applied Mathematics

Study anywhere. Anytime. Across all devices.

Solve the equation using mental math.
$- 4 + y = 9$