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Chapter 2: Q. 27 (page 87)

Solve the equation using mental math.

-  10a  =  130  

Short Answer

Expert verified

The solution of the equation is a = – 13

Step by step solution

01

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.

02

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.

03

Step 3: Solve the equation using mental math. -10a=130

Now solving the equation -10a=130with proper steps

−10a=130−10a−10=130−10Dividebothsidesby−10a=−13

Solution of the equation is a=-13

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Most popular questions from this chapter

Identify the property illustrated by the statementz4 · 1  =  z4.

Which property allows you to write?

4 + (3 +9 )  =  (4 +3)+9

Use the distributive property to write an equivalent variable expression.

-  2 (  3  -  r  )

Identify the property that the statement illustrates.

n+q=q+n

Use the distributive property to write an equivalent variable expression.

9  (3m+5)
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