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Chapter 2: Q13. (page 87)

Tell whether the given value of the variable is a solution of the equation.

21-z=-  4;  z=25

Short Answer

Expert verified

Yes, z=25is the solution of the equation 21-z=-  4;

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: Tell whether the given value of the variable is a solution of the equation.21-z=-  4;  z=25

Solving the equation:

21−z=−421−25=−4−4=−4

Yes, the solution of the equation is z=25

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Most popular questions from this chapter

Use the distributive property to evaluate the expression.

(6+21) (- 3)

ant Pumpkins A giant pumpkin can be difficult to weigh directly on a scale. To estimate the weight, you can first measure the distances a, b, and c (in inches) as shown below. The weight W (in pounds) can then be approximated using the formula W  =  1.9  (  a+b+c).

a. Use the distributive property to write the given formula without parentheses.

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