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Chapter 1: Q30. (page 31)

Solve each equation. Check your solution

y+9=21

Short Answer

Expert verified

The solutions of the equations are-30 or 12.

Step by step solution

01

Step1- Order for solving the equation

To evaluate any equation involving more than one operation, follow the below order operation

  • First assume the case one in which the equation be a=b
  • Secondly assume the case two in which the equation be a=-b
  • Solve the equations of both the cases to find the value of algebraic expression
  • After finding the two values of algebraic expression, put the value in the original equation and check the solution
02

Step2- Solve the equations  

Case 1: a=b

y+9=21y=21鈭�9=12

Case 2: a=-b

localid="1646755493379" y+9=鈭�21y=鈭�21鈭�9=鈭�30

03

Step3- Check the solutions

Put the value of y=12 in the equation y+9=21.

|y+9|=|12+9|=21

Put the value of y=-30 in equation y+9=21

|y+9|=|鈭�30+9|=|鈭�21|=21

The solution is -31 or 12.

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Most popular questions from this chapter

Find the value of each expression

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Name the property illustrated by each equation.

28. 5a+-5a=0

MEDICINE

Suppose a patient must take a blood pressure medication that is dispensed in 125-milligram tablets. The dosage is 15 milligrams per kilo gram of body weight and is given every 8 hours. If the patient weighs 25 kilograms, how many tablets would be needed for a 30-day supply? Use the formula n=24d梅8b脳15梅125, wheren is the number of tablets,d is the number of days the supply should last, andb is the body weight of the patient in kilograms.

Find the value ofabniflocalid="1646746061753" n=3,a=2000,b=-15
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