Ex 4.2, 3 - Solve (a) 3n - 2 = 46 (b) 5m + 7 = 17 (c) 20p/3 = 40

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Ex 4.2, 3 - Chapter 4 Class 7 Simple Equations - Part 2

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Ex 4.2, 3 - Chapter 4 Class 7 Simple Equations - Part 3 Ex 4.2, 3 - Chapter 4 Class 7 Simple Equations - Part 4

  1. Chapter 4 Class 7 Simple Equations
  2. Serial order wise

Transcript

Ex 4.2, 3 Give the steps you will use to separate the variable and then solve the equation: (a) 3n โ€“ 2 = 46 3n โˆ’ 2 = 46 Adding 2 to both sides 3n โˆ’ 2 + 2 = 46 + 2 3n = 48 Dividing 3 both sides 3๐‘›/3 = 48/3 n = 16 Ex 4.2, 3 Give the steps you will use to separate the variable and then solve the equation: (b) 5m + 7 = 175m + 7 = 17 Subtracting 7 from both sides, 5m + 7 โˆ’ 7 = 17 โˆ’ 7 5m = 10 Dividing 5 both sides 5๐‘š/5 = 10/5 m = 2 Ex 4.2, 3 Give the steps you will use to separate the variable and then solve the equation: (c) 20๐‘/3 = 4020๐‘/3 = 40 Multiplying 3 both sides 20๐‘/3 ร— 3 = 40 ร— 3 20p = 120 Dividing 20 both sides 20๐‘/20 = 120/20 p = 6 Ex 4.2, 3 Give the steps you will use to separate the variable and then solve the equation: (d) 3๐‘/10 = 63๐‘/10 = 6 Multiplying 10 both sides 3๐‘/10 ร— 10 = 6 ร— 10 3p = 60 Dividing 3 both sides 3๐‘/3 = 60/3 p = 20

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.