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Chapter 2: Q. 25 (page 87)

Solve the equation using mental math.

-2=r-7

Short Answer

Expert verified

The solution of the equation is r = 5

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. 0=t+79

Now solving the equation 0=t+79with proper steps

−2=r−7−2+7=r−7+7[Add7tobothsides]5=r⇔r=5

Solution of the equation is r=5

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Most popular questions from this chapter

Use the distributive property to evaluate the expression.

5  (  7 + 2 + 4  )

Evaluate the expression whenx  =  5  and  y  =  -  2.

33 xy

Use the distributive property to evaluate the expression.

-3  (9-1+6)

Which property allows you to write?

4 + (3 +9 )  =  (4 +3)+9

Perform the indicated operation. (pp. 750–752)

6.93  ÷  2.1
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